$NNBR
NN INC Stock $nnbr

$nnbr Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000091854121000003 Filed on March 15, 2021

Income Statement

Concept	2020 Q4	2020 Q3	2020 Q2
Revenue	$119.0M	$113.8M	$78.53M
YoY Change	7.55%	-5.56%	-39.98%
Cost Of Revenue	$94.00M	$90.10M	$65.10M
YoY Change	2.4%	-6.83%	55.74%
Gross Profit	$25.00M	$23.70M	$13.50M
YoY Change	32.28%	-0.42%	309.09%
Gross Profit Margin	21.0%	20.83%	17.19%
Selling, General & Admin	$13.90M	$13.75M	$14.27M
YoY Change	-12.58%	-11.28%	-46.63%
% of Gross Profit	55.6%	58.0%	105.73%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$11.56M	$11.44M	$11.33M
YoY Change	-49.48%	1.34%	-50.59%
% of Gross Profit	46.24%	48.25%	83.9%
Operating Expenses	$26.00M	$13.75M	$14.27M
YoY Change	-10.34%	-11.28%	-46.63%
Operating Profit	-$1.000M	-$1.456M	-$11.18M
YoY Change	-90.1%	-19.6%	-248.79%
Interest Expense	-$17.70M	$6.873M	$6.356M
YoY Change	321.43%	80.63%	-54.46%
% of Operating Profit
Other Income/Expense, Net	$300.0K	$262.0K	$1.215M
YoY Change	-400.0%	-141.39%	-2231.58%
Pretax Income	-$18.40M	-$8.211M	-$16.32M
YoY Change	25.17%	31.4%	150.93%
Income Tax	-$1.000M	-$8.715M	$2.175M
% Of Pretax Income
Net Earnings	$147.4M	$21.97M	-$21.75M
YoY Change	-1146.34%	-475.23%	198.61%
Net Earnings / Revenue	123.82%	19.31%	-27.69%
Basic Earnings Per Share	$3.41	$0.45	-$0.59
Diluted Earnings Per Share	$3.41	$0.45	-$0.59
COMMON SHARES
Basic Shares Outstanding	42.73M shares	42.20M shares	42.20M shares
Diluted Shares Outstanding		42.20M shares	42.20M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2020 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$48.10M	$56.10M	$82.70M
YoY Change	51.74%	129.92%	274.21%
Cash & Equivalents	$48.14M	$56.13M	$82.70M
Short-Term Investments
Other Short-Term Assets	$11.15M	$11.75M	$15.48M
YoY Change	-5.35%	-46.29%	-5.82%
Inventory	$62.52M	$63.72M	$121.0M
Prepaid Expenses
Receivables	$84.62M	$87.41M	$105.7M
Other Receivables	$8.800M	$13.70M	$17.40M
Total Short-Term Assets	$215.2M	$863.6M	$342.3M
YoY Change	-28.97%	173.0%	7.4%
LONG-TERM ASSETS
Property, Plant & Equipment	$223.7M	$225.5M	$344.1M
YoY Change	-12.61%	-38.13%	-6.61%
Goodwill	$0.00	$0.00	$196.5M
YoY Change	-100.0%	-100.0%	-55.31%
Intangibles
YoY Change
Long-Term Investments	$26.98M	$24.15M	$22.10M
YoY Change	24.03%	21.48%	8.32%
Other Assets	$5.742M	$6.716M	$7.350M
YoY Change	-33.03%	-9.16%	-7.67%
Total Long-Term Assets	$409.7M	$452.7M	$953.7M
YoY Change	-66.93%	-63.42%	-23.92%
TOTAL ASSETS
Total Short-Term Assets	$215.2M	$863.6M	$342.3M
Total Long-Term Assets	$409.7M	$452.7M	$953.7M
Total Assets	$625.0M	$1.316B	$1.296B
YoY Change	-59.47%	-15.29%	-17.57%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$37.44M	$42.89M	$43.75M
YoY Change	-8.63%	-34.55%	-31.1%
Accrued Expenses	$26.10M	$24.20M	$40.40M
YoY Change	-29.65%	-37.95%	8.31%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$4.885M	$713.4M	$20.57M
YoY Change	-74.43%	2686.41%	-18.11%
Total Short-Term Liabilities	$103.2M	$927.2M	$137.9M
YoY Change	-25.99%	494.3%	-7.69%
LONG-TERM LIABILITIES
Long-Term Debt	$79.03M	$117.5M	$817.0M
YoY Change	-89.56%	-86.04%	-3.93%
Other Long-Term Liabilities	$17.24M	$25.14M	$31.20M
YoY Change	-57.39%	-46.47%	-27.89%
Total Long-Term Liabilities	$96.26M	$142.6M	$848.2M
YoY Change	-87.93%	-83.95%	-5.09%
TOTAL LIABILITIES
Total Short-Term Liabilities	$103.2M	$927.2M	$137.9M
Total Long-Term Liabilities	$96.26M	$142.6M	$848.2M
Total Liabilities	$265.7M	$1.128B	$1.139B
YoY Change	-75.75%	-5.52%	-4.61%
SHAREHOLDERS EQUITY
Retained Earnings	-$205.9M	-$353.3M	-$375.2M
YoY Change	95.54%	257.22%	302.05%
Common Stock	$427.0K	$427.0K	$427.0K
YoY Change	0.95%	0.95%	0.71%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$254.2M	$86.35M	$57.90M
YoY Change
Total Liabilities & Shareholders Equity	$625.0M	$1.316B	$1.296B
YoY Change	-59.47%	-15.29%	-17.57%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2020 Q2
OPERATING ACTIVITIES
Net Income	$147.4M	$21.97M	-$21.75M
YoY Change	-1146.34%	-475.23%	198.61%
Depreciation, Depletion And Amortization	$11.56M	$11.44M	$11.33M
YoY Change	-49.48%	1.34%	-50.59%
Cash From Operating Activities	-$3.790M	$3.480M	$5.640M
YoY Change	-124.29%	-88.1%	-20.34%
INVESTING ACTIVITIES
Capital Expenditures	-$3.250M	-$4.900M	-$4.360M
YoY Change	-75.53%	-58.23%	-70.78%
Acquisitions
YoY Change
Other Investing Activities	$739.9M	$40.00K	$3.030M
YoY Change	15124.49%	-92.0%	-358.97%
Cash From Investing Activities	$736.7M	-$4.860M	-$1.330M
YoY Change	-8838.43%	-56.72%	-91.73%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-758.8M	-9.480M	-480.0K
YoY Change	47622.64%	-26.11%	-104.43%
NET CHANGE
Cash From Operating Activities	-3.790M	3.480M	5.640M
Cash From Investing Activities	736.7M	-4.860M	-1.330M
Cash From Financing Activities	-758.8M	-9.480M	-480.0K
Net Change In Cash	-25.93M	-10.86M	3.830M
YoY Change	-564.7%	-309.65%	109.29%
FREE CASH FLOW
Cash From Operating Activities	-$3.790M	$3.480M	$5.640M
Capital Expenditures	-$3.250M	-$4.900M	-$4.360M
Free Cash Flow	-$540.0K	$8.380M	$10.00M
YoY Change	-101.87%	-79.55%	-54.55%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000918541
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2020Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesCurrent
CY2019Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesCurrent
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	89000000	USD
CY2020	dei	Entity File Number EntityFileNumber	000-23486
CY2020	dei	Entity Registrant Name EntityRegistrantName	NN, Inc.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	62-1096725
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	6210 Ardrey Kell Road, Suite 600
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Charlotte
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	NC
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	28277
CY2020	dei	City Area Code CityAreaCode	980
CY2020	dei	Local Phone Number LocalPhoneNumber	264-4300
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	true
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	42791476	shares
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	427534000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	489514000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	524194000	USD
CY2020	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	343594000	USD
CY2019	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	392482000	USD
CY2018	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	413394000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	58055000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	68895000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	72764000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	45680000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	44896000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	43026000	USD
CY2020	nnbr	Restructuring And Integration Charges RestructuringAndIntegrationCharges	0	USD
CY2019	nnbr	Restructuring And Integration Charges RestructuringAndIntegrationCharges	-12000	USD
CY2018	nnbr	Restructuring And Integration Charges RestructuringAndIntegrationCharges	689000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	92942000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	182542000	USD
CY2020	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-4720000	USD
CY2019	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-846000	USD
CY2018	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-6826000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	-117457000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-17593000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	-195047000	USD
CY2020	us-gaap	Interest Expense InterestExpense	18898000	USD
CY2019	us-gaap	Interest Expense InterestExpense	13030000	USD
CY2018	us-gaap	Interest Expense InterestExpense	11315000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-144000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-540000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	nnbr	Derivative Instruments Payment Expense DerivativeInstrumentsPaymentExpense	4133000	USD
CY2019	nnbr	Derivative Instruments Payment Expense DerivativeInstrumentsPaymentExpense	0	USD
CY2018	nnbr	Derivative Instruments Payment Expense DerivativeInstrumentsPaymentExpense	0	USD
CY2020	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-11669000	USD
CY2019	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	0	USD
CY2018	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	0	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	213000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-962000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2016000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-152088000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-32125000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-208378000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-8972000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	305000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1548000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3626000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1681000	USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-14390000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-139490000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-30749000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-221220000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	38898000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-15992000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-41767000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-100592000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-46741000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-262987000	USD
CY2020	nnbr	Other Comprehensive Income Loss Reclassification Adjustmentfrom Aoci Discontinued Operationsafter Tax OtherComprehensiveIncomeLossReclassificationAdjustmentfromAOCIDiscontinuedOperationsafterTax	-5961000	USD
CY2019	nnbr	Other Comprehensive Income Loss Reclassification Adjustmentfrom Aoci Discontinued Operationsafter Tax OtherComprehensiveIncomeLossReclassificationAdjustmentfromAOCIDiscontinuedOperationsafterTax	0	USD
CY2018	nnbr	Other Comprehensive Income Loss Reclassification Adjustmentfrom Aoci Discontinued Operationsafter Tax OtherComprehensiveIncomeLossReclassificationAdjustmentfromAOCIDiscontinuedOperationsafterTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-1683000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-3845000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-13609000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-12443000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-10479000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-18987000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-1084000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	10822000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-13240000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-13609000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-89770000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-59981000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-276596000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-3.60
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.75
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-6.98
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.92
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.38
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-1.32
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.68
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.13
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-8.30
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42199000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42030000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	31678000	shares
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-3.60
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.75
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CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.92
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.38
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-1.32
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.68
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.13
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-8.30
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42199000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42030000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	31678000	shares
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	48138000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	17911000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	84615000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	83240000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	62517000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	67078000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	8800000	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	5973000	USD
CY2020Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	0	USD
CY2019Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	117000000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	11148000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	11778000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	215218000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	302980000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	223690000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	255977000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	50264000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	45452000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	0	USD
CY2019Q4	us-gaap	Goodwill Goodwill	94779000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	103065000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	117413000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	26983000	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	21755000	USD
CY2020Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	0	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	695054000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	5742000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	8574000	USD
CY2020Q4	us-gaap	Assets Assets	624962000	USD
CY2019Q4	us-gaap	Assets Assets	1541984000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	37435000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	40973000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	21296000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	15584000	USD
CY2020Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	3557000	USD
CY2019Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	684000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	4885000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	19106000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4797000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4288000	USD
CY2020Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	0	USD
CY2019Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	41546000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	31261000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	17300000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	103231000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	139481000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	11178000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	24461000	USD
CY2020Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	0	USD
CY2019Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	1272000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	79025000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	757250000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	55053000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	48575000	USD
CY2020Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	0	USD
CY2019Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	84199000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	17237000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	40457000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	265724000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	1095695000	USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	100000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	100000	shares
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	100000	shares
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	100000	shares
CY2020Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	105086000	USD
CY2019Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	93012000	USD
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	90000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	90000000	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	42313000	shares
CY2019	nnbr	Adjustments Related To Tax Withholding And Forfeited For Share Based Compensation AdjustmentsRelatedToTaxWithholdingAndForfeitedForShareBasedCompensation	365000	USD
CY2019	nnbr	Adjustmentsto Additional Paidin Capital Adjustmentsto Performance Shares Vesting Estimates AdjustmentstoAdditionalPaidinCapitalAdjustmentstoPerformanceSharesVestingEstimates	1052000	USD
CY2019Q4	us-gaap	Warrants And Rights Outstanding WarrantsAndRightsOutstanding	1076000	USD
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	42313000	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	42686000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	42686000	shares
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	427000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	423000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	493332000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	501615000	USD
CY2020Q4	us-gaap	Warrants And Rights Outstanding WarrantsAndRightsOutstanding	0	USD
CY2019Q4	us-gaap	Warrants And Rights Outstanding WarrantsAndRightsOutstanding	1076000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-205875000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-105283000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-33732000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-44554000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	254152000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	353277000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	624962000	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-1683000	USD
CY2020	us-gaap	Noncontrolling Interest Increase From Sale Of Parent Equity Interest NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest	5961000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1541984000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	485329000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-262987000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	8803000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	217312000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	274000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4384000	USD
CY2018	nnbr	Adjustments Related To Tax Withholding And Forfeited For Share Based Compensation AdjustmentsRelatedToTaxWithholdingAndForfeitedForShareBasedCompensation	805000	USD
CY2018	nnbr	Adjustmentsto Additional Paidin Capital Adjustmentsto Performance Shares Vesting Estimates AdjustmentstoAdditionalPaidinCapitalAdjustmentstoPerformanceSharesVestingEstimates	1840000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-13609000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	419271000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-46741000	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	8933000	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	642000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	21000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3933000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	3166000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-10479000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	327000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-1084000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-3845000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	353277000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-100592000	USD
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	12373000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4969000	USD
CY2020	nnbr	Adjustments Related To Tax Withholding And Forfeited For Share Based Compensation AdjustmentsRelatedToTaxWithholdingAndForfeitedForShareBasedCompensation	157000	USD
CY2020	nnbr	Adjustmentsto Additional Paidin Capital Adjustmentsto Performance Shares Vesting Estimates AdjustmentstoAdditionalPaidinCapitalAdjustmentstoPerformanceSharesVestingEstimates	718000	USD
CY2020	nnbr	Reclassification Of Warrants From Equity To Liabilities ReclassificationOfWarrantsFromEquityToLiabilities	1076000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	3764000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-12443000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	5742000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-18987000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	254152000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-100592000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-46741000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-262987000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	45680000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	44896000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	43026000	USD
CY2020	us-gaap	Depreciation And Amortization Discontinued Operations DepreciationAndAmortizationDiscontinuedOperations	35731000	USD
CY2019	us-gaap	Depreciation And Amortization Discontinued Operations DepreciationAndAmortizationDiscontinuedOperations	46950000	USD
CY2018	us-gaap	Depreciation And Amortization Discontinued Operations DepreciationAndAmortizationDiscontinuedOperations	28102000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	15692000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4789000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4845000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	92942000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	182542000	USD
CY2020	nnbr	Disposal Group Including Discontinued Operations Goodwill Impairment Loss DisposalGroupIncludingDiscontinuedOperationsGoodwillImpairmentLoss	146757000	USD
CY2019	nnbr	Disposal Group Including Discontinued Operations Goodwill Impairment Loss DisposalGroupIncludingDiscontinuedOperationsGoodwillImpairmentLoss	0	USD
CY2018	nnbr	Disposal Group Including Discontinued Operations Goodwill Impairment Loss DisposalGroupIncludingDiscontinuedOperationsGoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	4148000	USD
CY2019	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	643000	USD
CY2018	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	21825000	USD
CY2020	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	1532000	USD
CY2019	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	3293000	USD
CY2018	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	19562000	USD
CY2020	us-gaap	Gain Loss On Discontinuation Of Cash Flow Hedge Due To Forecasted Transaction Probable Of Not Occurring Net GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet	-15802000	USD
CY2019	us-gaap	Gain Loss On Discontinuation Of Cash Flow Hedge Due To Forecasted Transaction Probable Of Not Occurring Net GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet	0	USD
CY2018	us-gaap	Gain Loss On Discontinuation Of Cash Flow Hedge Due To Forecasted Transaction Probable Of Not Occurring Net GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet	0	USD
CY2020	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	3626000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	1681000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-642000	USD
CY2020	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	233824000	USD
CY2019	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2018	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2020	nnbr	Allocated Share Based Compensation Expense Excluding Discontinued Operations AllocatedShareBasedCompensationExpenseExcludingDiscontinuedOperations	4226000	USD
CY2019	nnbr	Allocated Share Based Compensation Expense Excluding Discontinued Operations AllocatedShareBasedCompensationExpenseExcludingDiscontinuedOperations	2822000	USD
CY2018	nnbr	Allocated Share Based Compensation Expense Excluding Discontinued Operations AllocatedShareBasedCompensationExpenseExcludingDiscontinuedOperations	2416000	USD
CY2020	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-21697000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-3142000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-22402000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-4730000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	3169000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	1290000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-10831000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-1265000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	3543000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-5114000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1426000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	16208000	USD
CY2019	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-8000000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-8606000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-7900000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	2693000	USD
CY2020	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-633000	USD
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-5292000	USD
CY2018	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	39615000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	10802000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	4711000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-479000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	15549000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	49208000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	40939000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	23773000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	54003000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	64036000	USD
CY2020	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	0	USD
CY2018	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	0	USD
CY2020	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	743178000	USD
CY2019	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	838000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	399009000	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3317000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	7287000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1434000	USD
CY2020	us-gaap	Payments For Hedge Investing Activities PaymentsForHedgeInvestingActivities	4133000	USD
CY2019	us-gaap	Payments For Hedge Investing Activities PaymentsForHedgeInvestingActivities	0	USD
CY2018	us-gaap	Payments For Hedge Investing Activities PaymentsForHedgeInvestingActivities	0	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-695000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	711000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	517000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	719284000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-39427000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-461290000	USD
CY2020	nnbr	Paymentsof Debt Issuance Costsand Prepayment Costs PaymentsofDebtIssuanceCostsandPrepaymentCosts	661000	USD
CY2019	nnbr	Paymentsof Debt Issuance Costsand Prepayment Costs PaymentsofDebtIssuanceCostsandPrepaymentCosts	11336000	USD
CY2018	nnbr	Paymentsof Debt Issuance Costsand Prepayment Costs PaymentsofDebtIssuanceCostsandPrepaymentCosts	20726000	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	0	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	8879000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	8826000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	217312000	USD
CY2020	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	95741000	USD
CY2018	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	66195000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	54209000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	311841000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	776331000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	108157000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	290687000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-924000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-12564000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	10305000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3133000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3715000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4126000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-714854000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	5299000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	215093000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-3544000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1365000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1200000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	16435000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	13715000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-206458000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	31703000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	17988000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	224446000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	48138000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	31703000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	17988000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	9644000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	23281000	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	26605000	USD
CY2020	nnbr	Restructuring Charges In Other Current And Noncurrent Liabilities RestructuringChargesInOtherCurrentAndNoncurrentLiabilities	0	USD
CY2019	nnbr	Restructuring Charges In Other Current And Noncurrent Liabilities RestructuringChargesInOtherCurrentAndNoncurrentLiabilities	-12000	USD
CY2018	nnbr	Restructuring Charges In Other Current And Noncurrent Liabilities RestructuringChargesInOtherCurrentAndNoncurrentLiabilities	2071000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	51542000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	50514000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	56223000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2241000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	6428000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-32582000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	13800000	USD
CY2018Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	10200000	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	200000	USD
CY2020	nnbr	Number Of Manufacturing Facilities NumberOfManufacturingFacilities	32	manufacturing_facility
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:9pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Use of Estimates in the Preparation of Consolidated Financial Statements</span></div><div style="margin-top:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of consolidated financial statements in accordance with U.S. GAAP requires management to use estimates and assumptions that affect the reported amounts of certain assets and liabilities, disclosure of contingent assets and liabilities, and the reported amounts of revenues and expenses. Actual results may differ from those estimates.</span></div>
CY2020Q4	nnbr	Cash And Cash Equivalents Held At Foreign Financial Institutions CashAndCashEquivalentsHeldAtForeignFinancialInstitutions	17000000.0	USD
CY2019Q4	nnbr	Cash And Cash Equivalents Held At Foreign Financial Institutions CashAndCashEquivalentsHeldAtForeignFinancialInstitutions	12700000	USD
CY2020	us-gaap	Adjustment For Long Term Intercompany Transactions Net Of Tax AdjustmentForLongTermIntercompanyTransactionsNetOfTax	800000	USD
CY2019	us-gaap	Adjustment For Long Term Intercompany Transactions Net Of Tax AdjustmentForLongTermIntercompanyTransactionsNetOfTax	400000	USD
CY2018	us-gaap	Adjustment For Long Term Intercompany Transactions Net Of Tax AdjustmentForLongTermIntercompanyTransactionsNetOfTax	3600000	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	427534000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	45680000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	92942000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	-117457000	USD
CY2020	us-gaap	Interest Expense InterestExpense	18898000	USD
CY2020	nnbr	Gain Loss On Derivatives And Other Nonoperating Income Expense Net GainLossOnDerivativesAndOtherNonoperatingIncomeExpenseNet	-15733000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-152088000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3626000	USD
CY2020	nnbr	Paymentsto Acquire Property Plantand Equipment Continuing Operations PaymentstoAcquirePropertyPlantandEquipmentContinuingOperations	15357000	USD
CY2020Q4	us-gaap	Assets Assets	624962000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	489514000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	44896000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-17593000	USD
CY2019	us-gaap	Interest Expense InterestExpense	13030000	USD
CY2019	nnbr	Gain Loss On Derivatives And Other Nonoperating Income Expense Net GainLossOnDerivativesAndOtherNonoperatingIncomeExpenseNet	-1502000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-32125000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1681000	USD
CY2019	nnbr	Paymentsto Acquire Property Plantand Equipment Continuing Operations PaymentstoAcquirePropertyPlantandEquipmentContinuingOperations	32169000	USD
CY2019Q4	us-gaap	Assets Assets	1541984000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	524194000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	43026000	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	182542000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	-195047000	USD
CY2018	us-gaap	Interest Expense InterestExpense	11315000	USD
CY2018	nnbr	Gain Loss On Derivatives And Other Nonoperating Income Expense Net GainLossOnDerivativesAndOtherNonoperatingIncomeExpenseNet	-2016000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-208378000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-14390000	USD
CY2018	nnbr	Paymentsto Acquire Property Plantand Equipment Continuing Operations PaymentstoAcquirePropertyPlantandEquipmentContinuingOperations	49277000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	223690000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	255977000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	86659000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	85284000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2044000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2044000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	84615000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	83240000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2044000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2517000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2339000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	505000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	231000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	628000	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	562000	USD
CY2019	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	692000	USD
CY2018	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	400000	USD
CY2020	nnbr	Allowance For Doubtful Accounts Receivable Translation Adjustments AllowanceForDoubtfulAccountsReceivableTranslationAdjustments	-57000	USD
CY2019	nnbr	Allowance For Doubtful Accounts Receivable Translation Adjustments AllowanceForDoubtfulAccountsReceivableTranslationAdjustments	12000	USD
CY2018	nnbr	Allowance For Doubtful Accounts Receivable Translation Adjustments AllowanceForDoubtfulAccountsReceivableTranslationAdjustments	50000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2044000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2044000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2517000	USD
CY2020Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	22589000	USD
CY2019Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	34816000	USD
CY2020Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	20758000	USD
CY2019Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	17810000	USD
CY2020Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	19170000	USD
CY2019Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	14452000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	62517000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	67078000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	398834000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	403748000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	175144000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	147771000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	223690000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	255977000	USD
CY2020	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	4100000	USD
CY2019	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	600000	USD
CY2018	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	5200000	USD
CY2020	us-gaap	Depreciation Depreciation	31300000	USD
CY2019	us-gaap	Depreciation Depreciation	30400000	USD
CY2018	us-gaap	Depreciation Depreciation	28500000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	94505000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	274000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	94779000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-1837000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	92942000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	0	USD
CY2020Q4	us-gaap	Goodwill Gross GoodwillGross	292045000	USD
CY2020Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	292045000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	0	USD
CY2019Q4	us-gaap	Goodwill Gross GoodwillGross	293086000	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	198307000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	94779000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	0	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	131883000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	14473000	USD
CY2019	us-gaap	Finite Lived Intangible Assets Foreign Currency Translation Gain Loss FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss	3000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	117413000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	14348000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	103065000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	181273000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	78208000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	103065000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	181273000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	63860000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	117413000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	14347000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	14347000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	14262000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	13919000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	13919000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	32271000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	103065000	USD
CY2019	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2020	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-146963000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-31760000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-200164000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-5125000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-365000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-8214000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-152088000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-32125000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-208378000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-299000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-5948000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	5684000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4599000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1656000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	58000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2250000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2247000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2271000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	6550000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-2045000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	8013000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-10368000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1430000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-6028000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-5368000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3850000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-214000	USD
CY2020	nnbr	Deferred Federal And Foreign Income Tax Expense Benefit Valuation Allowance DeferredFederalAndForeignIncomeTaxExpenseBenefitValuationAllowance	-2066000	USD
CY2019	nnbr	Deferred Federal And Foreign Income Tax Expense Benefit Valuation Allowance DeferredFederalAndForeignIncomeTaxExpenseBenefitValuationAllowance	592000	USD
CY2018	nnbr	Deferred Federal And Foreign Income Tax Expense Benefit Valuation Allowance DeferredFederalAndForeignIncomeTaxExpenseBenefitValuationAllowance	-2263000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1852000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	522000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-5582000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-15522000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2350000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-9561000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-8972000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	305000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1548000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.013
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.018
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.002
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.011
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.022
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.043
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.005
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.136
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.001
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.014
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.030
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.003
CY2020	nnbr	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Percent EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomePercent	-0.001
CY2019	nnbr	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Percent EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomePercent	0
CY2018	nnbr	Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income Percent EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomePercent	0
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	-0.127
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	-0.177
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	-0.022
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	-0.002
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.004
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.022
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.003
CY2020	nnbr	Effective Income Tax Rate Reconciliation Toll Charge Net Of Foreign Tax Credit Percent EffectiveIncomeTaxRateReconciliationTollChargeNetOfForeignTaxCreditPercent	0
CY2019	nnbr	Effective Income Tax Rate Reconciliation Toll Charge Net Of Foreign Tax Credit Percent EffectiveIncomeTaxRateReconciliationTollChargeNetOfForeignTaxCreditPercent	0
CY2018	nnbr	Effective Income Tax Rate Reconciliation Toll Charge Net Of Foreign Tax Credit Percent EffectiveIncomeTaxRateReconciliationTollChargeNetOfForeignTaxCreditPercent	0.007
CY2020	nnbr	Effective Income Tax Rate Reconciliation Remeasurement Of Deferred Taxes Pursuant To Tax Reform Percent EffectiveIncomeTaxRateReconciliationRemeasurementOfDeferredTaxesPursuantToTaxReformPercent	0
CY2019	nnbr	Effective Income Tax Rate Reconciliation Remeasurement Of Deferred Taxes Pursuant To Tax Reform Percent EffectiveIncomeTaxRateReconciliationRemeasurementOfDeferredTaxesPursuantToTaxReformPercent	0
CY2018	nnbr	Effective Income Tax Rate Reconciliation Remeasurement Of Deferred Taxes Pursuant To Tax Reform Percent EffectiveIncomeTaxRateReconciliationRemeasurementOfDeferredTaxesPursuantToTaxReformPercent	-0.012
CY2020	nnbr	Effective Income Tax Rate Reconciliation Impactof Treasury Regulations Percent EffectiveIncomeTaxRateReconciliationImpactofTreasuryRegulationsPercent	0
CY2019	nnbr	Effective Income Tax Rate Reconciliation Impactof Treasury Regulations Percent EffectiveIncomeTaxRateReconciliationImpactofTreasuryRegulationsPercent	-0.184
CY2018	nnbr	Effective Income Tax Rate Reconciliation Impactof Treasury Regulations Percent EffectiveIncomeTaxRateReconciliationImpactofTreasuryRegulationsPercent	0
CY2020	nnbr	Effective Income Tax Rate Reconciliation Cares Act EffectiveIncomeTaxRateReconciliationCARESAct	0.027
CY2019	nnbr	Effective Income Tax Rate Reconciliation Cares Act EffectiveIncomeTaxRateReconciliationCARESAct	0
CY2018	nnbr	Effective Income Tax Rate Reconciliation Cares Act EffectiveIncomeTaxRateReconciliationCARESAct	0
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Disposition Of Business EffectiveIncomeTaxRateReconciliationDispositionOfBusiness	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Disposition Of Business EffectiveIncomeTaxRateReconciliationDispositionOfBusiness	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Disposition Of Business EffectiveIncomeTaxRateReconciliationDispositionOfBusiness	-0.011
CY2020	nnbr	Effective Income Tax Rate Reconciliation Returnto Provision EffectiveIncomeTaxRateReconciliationReturntoProvision	-0.005
CY2019	nnbr	Effective Income Tax Rate Reconciliation Returnto Provision EffectiveIncomeTaxRateReconciliationReturntoProvision	-0.002
CY2018	nnbr	Effective Income Tax Rate Reconciliation Returnto Provision EffectiveIncomeTaxRateReconciliationReturntoProvision	-0.010
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	-0.039
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	-0.022
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Restructuring Charges EffectiveIncomeTaxRateReconciliationNondeductibleExpenseRestructuringCharges	-0.026
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Restructuring Charges EffectiveIncomeTaxRateReconciliationNondeductibleExpenseRestructuringCharges	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Restructuring Charges EffectiveIncomeTaxRateReconciliationNondeductibleExpenseRestructuringCharges	0
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.009
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.033
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.001
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.059
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.010
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.007
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.059
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.010
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2019	us-gaap	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Income Tax Expense Benefit TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit	6000000.0	USD
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.007
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	27459000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	28329000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	23695000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	26474000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	11149000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	12697000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	6601000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	0	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	533000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2178000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	69437000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	69678000	USD
CY2020Q4	nnbr	Deferred Tax Asset Interest Expense Limitation DeferredTaxAssetInterestExpenseLimitation	3811000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	3419000	USD
CY2019Q4	nnbr	Deferred Tax Asset Interest Expense Limitation DeferredTaxAssetInterestExpenseLimitation	14073000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	25653000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	386000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	3224000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	2447000	USD
CY2020Q4	nnbr	Deferred Tax Assets Interest Rate Swap DeferredTaxAssetsInterestRateSwap	3611000	USD
CY2019Q4	nnbr	Deferred Tax Assets Interest Rate Swap DeferredTaxAssetsInterestRateSwap	2838000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	2909000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	1669000	USD
CY2020Q4	nnbr	Deferred Tax Asset Operating Lease Right Of Use Assets DeferredTaxAssetOperatingLeaseRightOfUseAssets	13209000	USD
CY2019Q4	nnbr	Deferred Tax Asset Operating Lease Right Of Use Assets DeferredTaxAssetOperatingLeaseRightOfUseAssets	14438000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	18659000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	15486000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	2463000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	3574000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	2399000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	2335000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2891000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1157000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	79940000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	60711000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	21681000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	15494000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	58259000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	45217000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	11178000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	24461000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other Tax Carryforwards DeferredTaxAssetsOtherTaxCarryforwards	700000	USD
CY2020Q4	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Undistributed Earnings Of Foreign Subsidiaries DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries	6600000	USD
CY2020Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	600000	USD
CY2019Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	1500000	USD
CY2018Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	1300000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2589000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4609000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	5655000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	121000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	304000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	275000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2463000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1745000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1350000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	247000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	7276000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2589000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4609000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	800000	USD
CY2020	us-gaap	Income Tax Holiday Aggregate Dollar Amount IncomeTaxHolidayAggregateDollarAmount	200000	USD
CY2019	us-gaap	Income Tax Holiday Aggregate Dollar Amount IncomeTaxHolidayAggregateDollarAmount	0	USD
CY2018	us-gaap	Income Tax Holiday Aggregate Dollar Amount IncomeTaxHolidayAggregateDollarAmount	0	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	84862000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	793003000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	4885000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	19106000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	79977000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	773897000	USD
CY2020Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	952000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	16647000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	79025000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	757250000	USD
CY2020Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	1800000	USD
CY2019Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	3000000.0	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	200000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1500000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	1100000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	4885000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	71664000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	1632000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	1474000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1553000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	3654000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	84862000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1272000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1229000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	192000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	226000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	8396000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	9108000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	591000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	479000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	1000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	1000	USD
CY2020	us-gaap	Lease Cost LeaseCost	10452000	USD
CY2019	us-gaap	Lease Cost LeaseCost	11043000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	50264000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	45452000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	14644000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	13267000	USD
CY2020Q4	nnbr	Lease Right Of Use Asset LeaseRightOfUseAsset	64908000	USD
CY2019Q4	nnbr	Lease Right Of Use Asset LeaseRightOfUseAsset	58719000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4797000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4288000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4252000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	2701000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	55053000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	48575000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	6858000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	7911000	USD
CY2020Q4	nnbr	Lease Liability LeaseLiability	70960000	USD
CY2019Q4	nnbr	Lease Liability LeaseLiability	63475000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	192000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	226000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	13498000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	14090000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2018000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3156000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	728000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	5250000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	8682000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	8457000	USD
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y2M12D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P4Y
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	7370000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	2365000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P11Y8M12D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P11Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.022
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.022
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.070
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.057
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	9348000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	4442000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	8485000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	3107000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	1122000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	7194000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	223000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	48523000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	210000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	88196000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	11469000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	28346000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	359000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	59850000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	11110000	USD
CY2020Q1	us-gaap	Operating Lease Expense OperatingLeaseExpense	27500000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Term Of Contract LesseeOperatingLeaseTermOfContract	P15Y
CY2020Q1	nnbr	Operating Lease Reduction Of Base Rent Payments Over Lease Term OperatingLeaseReductionOfBaseRentPaymentsOverLeaseTerm	1300000	USD
CY2020Q1	nnbr	Increase Decrease In Operating Lease Rightof Use Asset IncreaseDecreaseInOperatingLeaseRightofUseAsset	-8100000	USD
CY2020Q1	nnbr	Increase Decrease In Operating Lease Liability Noncurrent IncreaseDecreaseInOperatingLeaseLiabilityNoncurrent	-10500000	USD
CY2020Q1	nnbr	Increase Decrease In Operating Lease Liability Current IncreaseDecreaseInOperatingLeaseLiabilityCurrent	-600000	USD
CY2020Q1	nnbr	Increase Decrease In Change Between Operating Lease Rightof Use Assetsand Operating Lease Liabilities Net IncreaseDecreaseInChangeBetweenOperatingLeaseRightofUseAssetsandOperatingLeaseLiabilitiesNet	3000000.0	USD
CY2020Q1	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	-4400000	USD
CY2020Q1	us-gaap	Impairment Of Leasehold ImpairmentOfLeasehold	2900000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	8700000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2019	us-gaap	Other Restructuring Costs OtherRestructuringCosts	-12000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	-12000	USD
CY2018	us-gaap	Severance Costs1 SeveranceCosts1	626000	USD
CY2018	us-gaap	Other Restructuring Costs OtherRestructuringCosts	63000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	689000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2018Q4	us-gaap	Restructuring Reserve RestructuringReserve	153000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	-12000	USD
CY2019	us-gaap	Restructuring Reserve Settled Without Cash2 RestructuringReserveSettledWithoutCash2	0	USD
CY2019	us-gaap	Payments For Restructuring PaymentsForRestructuring	141000	USD
CY2018Q3	us-gaap	Shares Issued Price Per Share SharesIssuedPricePerShare	16.00
CY2019Q4	us-gaap	Restructuring Reserve RestructuringReserve	0	USD
CY2017Q4	us-gaap	Restructuring Reserve RestructuringReserve	1099000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	689000	USD
CY2018	us-gaap	Restructuring Reserve Settled Without Cash2 RestructuringReserveSettledWithoutCash2	56000	USD
CY2018	us-gaap	Payments For Restructuring PaymentsForRestructuring	1579000	USD
CY2018Q4	us-gaap	Restructuring Reserve RestructuringReserve	153000	USD
CY2019Q4	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	14400000	shares
CY2019Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	1500000	shares
CY2019Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	12.00
CY2020Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	105100000	USD
CY2020	us-gaap	Temporary Equity Dividends Adjustment TemporaryEquityDividendsAdjustment	13000000.0	USD
CY2018Q3	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	14400000	shares
CY2018Q3	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	217300000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	427534000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	489514000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	524194000	USD
CY2020Q4	nnbr	Share Based Compensation Arrangement By Share Based Payment Award Maximum Number Of Shares Available ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesAvailable	2700000	shares
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4226000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2822000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2416000	USD
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	3600000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y2M12D
CY2020	nnbr	Share Based Compensation Arrangement By Share Based Payment Award Term Of Award ShareBasedCompensationArrangementByShareBasedPaymentAwardTermOfAward	P10Y
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	158700	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	210400	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	57800	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	4.76
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	2.77
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	10.60
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	775000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	13.24
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	159000	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	9.44
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	63000	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	15.09
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	871000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	12.41
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	682000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	13.17
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y8M12D
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	0	USD
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	100000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	300000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	100000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	100000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	7000.0	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	500000	USD
CY2019	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-14324000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-13240000	USD
CY2020	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-14126000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	5961000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	10822000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-139490000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-30749000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-221220000	USD
CY2020	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	12373000	USD
CY2019	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	642000	USD
CY2018	us-gaap	Preferred Stock Dividends And Other Adjustments PreferredStockDividendsAndOtherAdjustments	0	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-151863000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-151863000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-31391000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-31391000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-221220000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-221220000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	38898000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-15992000	USD
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-41767000	USD
CY2020	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Diluted UndistributedEarningsLossAvailableToCommonShareholdersDiluted	-112965000	USD
CY2020	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	-112965000	USD
CY2019	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	-47383000	USD
CY2019	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Diluted UndistributedEarningsLossAvailableToCommonShareholdersDiluted	-47383000	USD
CY2018	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Diluted UndistributedEarningsLossAvailableToCommonShareholdersDiluted	-262987000	USD
CY2018	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	-262987000	USD
CY2020	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	42199000	shares
CY2019	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	42030000	shares
CY2018	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	31678000	shares
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-3.60
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.75
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-6.98
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.92
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.38
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-1.32
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.68
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.13
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-8.30
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-3.60
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.75
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-6.98
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.92
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.38
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-1.32
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.68
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.13
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-8.30
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.21
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.28
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	21392000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	15053000	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	428000	shares
CY2020	nnbr	Anti Dilutive Securities Excluded From Computation Of Earnings Per Share Minimum Price Range AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMinimumPriceRange	7.93
CY2020	nnbr	Anti Dilutive Securities Excluded From Computation Of Earnings Per Share Maximum Price Range One AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMaximumPriceRangeOne	25.16
CY2019	nnbr	Anti Dilutive Securities Excluded From Computation Of Earnings Per Share Minimum Price Range AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMinimumPriceRange	8.54
CY2019	nnbr	Anti Dilutive Securities Excluded From Computation Of Earnings Per Share Maximum Price Range One AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMaximumPriceRangeOne	25.16
CY2018	nnbr	Anti Dilutive Securities Excluded From Computation Of Earnings Per Share Minimum Price Range AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMinimumPriceRange	4.42
CY2018	nnbr	Anti Dilutive Securities Excluded From Computation Of Earnings Per Share Maximum Price Range One AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMaximumPriceRangeOne	25.16
CY2019Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	12.00
CY2020	nnbr	Preferred Stock Conversion Limit Percent PreferredStockConversionLimitPercent	25
CY2020	nnbr	Preferred Stock Periodof Volume Weighted Average Price Per Common Share PreferredStockPeriodofVolumeWeightedAveragePricePerCommonShare	P30D
CY2020	nnbr	Preferred Stock Conversion Percentage Of Volume Weighted Average Market Price Percent PreferredStockConversionPercentageOfVolumeWeightedAverageMarketPricePercent	0.90
CY2020Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	12.00
CY2019Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	2295000	USD
CY2018Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	0	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues	0	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues	2295000	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	-493000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	0	USD
CY2020	nnbr	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Other FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityOther	1315000	USD
CY2019	nnbr	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Other FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityOther	0	USD
CY2020Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	3117000	USD
CY2019Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	2295000	USD
CY2020	nnbr	Reclassification Of Warrants From Equity To Liabilities ReclassificationOfWarrantsFromEquityToLiabilities	1100000	USD
CY2020Q4	us-gaap	Warrants And Rights Outstanding Term WarrantsAndRightsOutstandingTerm	P2Y4M24D
CY2019Q4	us-gaap	Warrants And Rights Outstanding Term WarrantsAndRightsOutstandingTerm	P1Y3M18D
CY2020	nnbr	Derivative Instruments Payment Expense DerivativeInstrumentsPaymentExpense	4133000	USD
CY2019	nnbr	Derivative Instruments Payment Expense DerivativeInstrumentsPaymentExpense	0	USD
CY2020	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-11669000	USD
CY2019	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	0	USD
CY2020Q4	us-gaap	Lines Of Credit Fair Value Disclosure LinesOfCreditFairValueDisclosure	14400000	USD
CY2019Q4	us-gaap	Lines Of Credit Fair Value Disclosure LinesOfCreditFairValueDisclosure	9600000	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	14400000	USD
CY2019Q4	us-gaap	Line Of Credit LineOfCredit	9600000	USD
CY2020Q1	us-gaap	Revenues Revenues	116213000	USD
CY2020Q2	us-gaap	Revenues Revenues	78532000	USD
CY2020Q3	us-gaap	Revenues Revenues	113761000	USD
CY2020Q4	us-gaap	Revenues Revenues	119028000	USD
CY2020Q1	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	94478000	USD
CY2020Q2	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	65058000	USD
CY2020Q3	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	90076000	USD
CY2020Q4	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	93982000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-108077000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-17566000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1640000	USD
CY2020Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-15487000	USD
CY2020Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-140114000	USD
CY2020Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-4182000	USD
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	20330000	USD
CY2020Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	162864000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-248191000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	-21748000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	21970000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	147377000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-272690000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-19371000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	31851000	USD
CY2020Q4	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	170440000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-2.64
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.49
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.04
CY2020Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.44
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-5.96
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.59
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.41
CY2020Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-2.64
CY2020Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.49
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.04
CY2020Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.44
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-5.96
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.59
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.41
CY2019Q1	us-gaap	Revenues Revenues	127528000	USD
CY2019Q2	us-gaap	Revenues Revenues	130851000	USD
CY2019Q3	us-gaap	Revenues Revenues	120459000	USD
CY2019Q4	us-gaap	Revenues Revenues	110676000	USD
CY2019Q1	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	101369000	USD
CY2019Q2	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	102643000	USD
CY2019Q3	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	96654000	USD
CY2019Q4	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	91816000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-11517000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-4453000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-4836000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-9943000	USD
CY2019Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-8001000	USD
CY2019Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-2830000	USD
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-1019000	USD
CY2019Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-4142000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-19518000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.11
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	-7283000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-5855000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	-14085000	USD
CY2019Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-22053000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-15742000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-17976000	USD
CY2019Q4	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-4210000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.27
CY2019Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.11
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.12
CY2019Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.25
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.47
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.17
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.14
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.35
CY2019Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.27
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.12
CY2019Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.25
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.47
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.17
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.14
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.35

Files In Submission

Name	View Source	Status
0000918541-21-000003-index-headers.html	Edgar Link	pending
0000918541-21-000003-index.html	Edgar Link	pending
0000918541-21-000003.txt	Edgar Link	pending
0000918541-21-000003-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
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nnbr-20201231.htm	Edgar Link	pending
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nnbr-20201231_htm.xml	Edgar Link	completed
nnbr-20201231_lab.xml	Edgar Link	unprocessable
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$NNBR
NN INC Stock $nnbr

2020 Q4 Form 10-K Financial Statement

#000091854121000003 Filed on March 15, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NNBR NN INC Stock $nnbr

2020 Q4 Form 10-K Financial Statement

#000091854121000003 Filed on March 15, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NNBR
NN INC Stock $nnbr