$NHC
NATIONAL HEALTHCARE CORP Stock $nhc

$nhc Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000143774922003787 Filed on February 18, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$283.4M	$1.074B	$259.8M
YoY Change	9.09%	4.48%	2.34%
Cost Of Revenue	$157.4M	$618.7M	$147.4M
YoY Change	6.83%	4.14%	-2.67%
Gross Profit	$126.0M	$455.6M	$112.5M
YoY Change	12.04%	4.95%	9.74%
Gross Profit Margin	44.46%	42.41%	43.29%
Selling, General & Admin	$10.38M	$40.82M	$9.522M
YoY Change	9.02%	0.8%	-3.97%
% of Gross Profit	8.24%	8.96%	8.47%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$10.15M	$40.67M	$10.49M
YoY Change	-3.2%	-3.2%	-3.82%
% of Gross Profit	8.06%	8.93%	9.32%
Operating Expenses	$86.90M	$374.1M	$76.04M
YoY Change	14.28%	11.04%	-11.07%
Operating Profit	$39.11M	$50.93M	$36.43M
YoY Change	7.36%	5.75%	120.85%
Interest Expense	$11.71M	$845.0K	$24.02M
YoY Change	-51.27%	-39.6%	1552.06%
% of Operating Profit	29.93%	1.66%	65.93%
Other Income/Expense, Net		$17.77M
YoY Change		-33.0%
Pretax Income	$21.04M	$150.0M	$37.05M
YoY Change	-43.21%	186.21%	100.89%
Income Tax	$5.044M	$10.95M	$9.633M
% Of Pretax Income	23.97%	7.3%	26.0%
Net Earnings	$15.79M	$138.6M	$27.55M
YoY Change	-42.69%	230.99%	100.07%
Net Earnings / Revenue	5.57%	12.9%	10.6%
Basic Earnings Per Share		$9.03
Diluted Earnings Per Share	$1.024M	$8.99	$1.792M
COMMON SHARES
Basic Shares Outstanding	15.42M	15.35M	15.36M
Diluted Shares Outstanding		15.42M

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$419.8M	$256.0M	$470.2M
YoY Change	-10.72%	-20.84%	563.09%
Cash & Equivalents	$107.6M	$107.6M	$147.1M
Short-Term Investments	$312.2M	$148.4M	$323.1M
Other Short-Term Assets	$65.45M	$65.45M	$33.93M
YoY Change	92.9%	92.9%	1.0%
Inventory	$8.582M	$8.582M	$8.781M
Prepaid Expenses
Receivables	$96.12M	$96.12M	$89.67M
Other Receivables	$453.0K	$453.0K	$928.0K
Total Short-Term Assets	$426.6M	$426.6M	$456.8M
YoY Change	-6.59%	-6.59%	33.92%
LONG-TERM ASSETS
Property, Plant & Equipment	$521.0M	$677.1M	$520.3M
YoY Change	0.13%	-3.18%	-2.82%
Goodwill	$168.3M		$168.3M
YoY Change	0.0%		701.6%
Intangibles	$7.038M		$0.00
YoY Change
Long-Term Investments	$2.022M	$2.022M	$40.78M
YoY Change	-95.04%	-95.04%	4.06%
Other Assets	$455.8M	$122.3M	$385.1M
YoY Change	18.36%	-7.21%	-6.12%
Total Long-Term Assets	$976.8M	$976.8M	$905.4M
YoY Change	7.88%	7.88%	-4.25%
TOTAL ASSETS
Total Short-Term Assets	$426.6M	$426.6M	$456.8M
Total Long-Term Assets	$976.8M	$976.8M	$905.4M
Total Assets	$1.403B	$1.403B	$1.362B
YoY Change	3.03%	3.03%	5.87%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$22.49M	$22.49M	$21.11M
YoY Change	6.52%	6.52%	11.69%
Accrued Expenses	$165.4M	$165.4M	$142.6M
YoY Change	16.0%	16.0%	15.37%
Deferred Revenue	$15.02M		$51.25M
YoY Change	-70.69%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$4.695M	$4.695M	$0.00
YoY Change		6.15%	-100.0%
Total Short-Term Liabilities	$263.2M	$263.2M	$281.2M
YoY Change	-6.41%	-6.41%	44.39%
LONG-TERM LIABILITIES
Long-Term Debt	$5.845M	$5.845M	$10.54M
YoY Change	-44.54%	-44.54%
Other Long-Term Liabilities	$16.57M	$219.0M	$28.38M
YoY Change	-41.6%	-15.11%	33.66%
Total Long-Term Liabilities	$16.57M	$224.9M	$28.38M
YoY Change	-41.6%	-16.26%	33.66%
TOTAL LIABILITIES
Total Short-Term Liabilities	$263.2M	$263.2M	$281.2M
Total Long-Term Liabilities	$16.57M	$224.9M	$28.38M
Total Liabilities	$494.9M	$500.4M	$563.9M
YoY Change	-12.23%	-11.74%	11.09%
SHAREHOLDERS EQUITY
Retained Earnings	$669.1M		$563.0M
YoY Change	18.84%		1.8%
Common Stock	$154.0K		$153.0K
YoY Change	0.65%		0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$903.0M	$903.0M	$795.2M
YoY Change
Total Liabilities & Shareholders Equity	$1.403B	$1.403B	$1.362B
YoY Change	3.03%	3.03%	5.87%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$15.79M	$138.6M	$27.55M
YoY Change	-42.69%	230.99%	100.07%
Depreciation, Depletion And Amortization	$10.15M	$40.67M	$10.49M
YoY Change	-3.2%	-3.2%	-3.82%
Cash From Operating Activities	$15.52M	$62.39M	$19.36M
YoY Change	-19.82%	-69.3%	-23.24%
INVESTING ACTIVITIES
Capital Expenditures	-$13.63M	$39.40M	-$4.156M
YoY Change	227.84%	80.13%	-38.25%
Acquisitions
YoY Change
Other Investing Activities	$573.0K	-$26.49M	-$44.45M
YoY Change	-101.29%	-36.94%	-2042.7%
Cash From Investing Activities	-$13.05M	-$65.89M	-$48.61M
YoY Change	-73.15%	3.15%	994.21%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		-$2.605M
YoY Change		52.97%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-9.495M	-$35.26M	-8.370M
YoY Change	13.44%	-15.82%	-69.95%
NET CHANGE
Cash From Operating Activities	15.52M	$62.39M	19.36M
Cash From Investing Activities	-13.05M	-$65.89M	-48.61M
Cash From Financing Activities	-9.495M	-$35.26M	-8.370M
Net Change In Cash	-7.024M	-$38.76M	-37.62M
YoY Change	-81.33%	-139.76%	431.9%
FREE CASH FLOW
Cash From Operating Activities	$15.52M	$62.39M	$19.36M
Capital Expenditures	-$13.63M	$39.40M	-$4.156M
Free Cash Flow	$29.15M	$23.00M	$23.51M
YoY Change	23.95%	-87.32%	-26.4%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	6759000	USD
CY2021	dei	Auditor Firm AuditorFirmId	42
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	45000000
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	45000000
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	15452033
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	15452033
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	15369745
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	15369745
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.06
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.08
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.11
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	pure
CY2020Q4	us-gaap	Continuing Care Retirement Communities Advance Fees Obligation For Future Services Amount ContinuingCareRetirementCommunitiesAdvanceFeesObligationForFutureServicesAmount	2177000	USD
CY2021Q4	nhc	Interest Rate On Unrecouped Amounts Due Percent InterestRateOnUnrecoupedAmountsDuePercent	0.04	Rate
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	0	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	5111000	USD
CY2021	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	pure
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.47
CY2021	us-gaap	Other Than Temporary Impairment Loss Debt Securities Available For Sale OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSale	0	USD
CY2020	us-gaap	Other Than Temporary Impairment Loss Debt Securities Available For Sale OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSale	0	USD
CY2020	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2019	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2021	nhc	Effective Income Tax Rate Reconciliation Benefit Resulting From Expiration Of Applicable Statute Limitations Amount EffectiveIncomeTaxRateReconciliationBenefitResultingFromExpirationOfApplicableStatuteLimitationsAmount	1901000	USD
CY2019	nhc	Effective Income Tax Rate Reconciliation Benefit Resulting From Expiration Of Applicable Statute Limitations Amount EffectiveIncomeTaxRateReconciliationBenefitResultingFromExpirationOfApplicableStatuteLimitationsAmount	2064000	USD
CY2021	us-gaap	Open Tax Year OpenTaxYear	2018 2019 2020 2021
CY2021	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	965542000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	931795000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	947872000	USD
CY2021	nhc	Other Revenues OtherRevenues	45400000	USD
CY2020	nhc	Other Revenues OtherRevenues	48917000	USD
CY2019	nhc	Other Revenues OtherRevenues	48511000	USD
CY2021	nhc	Government Assistance Stimulus Income Cares Act GovernmentAssistanceStimulusIncomeCaresAct	63360000	USD
CY2020	nhc	Government Assistance Stimulus Income Cares Act GovernmentAssistanceStimulusIncomeCaresAct	47505000	USD
CY2019	nhc	Government Assistance Stimulus Income Cares Act GovernmentAssistanceStimulusIncomeCaresAct	0	USD
CY2021	us-gaap	Revenues Revenues	1074302000	USD
CY2020	us-gaap	Revenues Revenues	1028217000	USD
CY2019	us-gaap	Revenues Revenues	996383000	USD
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	629672000	USD
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	609306000	USD
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	592831000	USD
CY2021	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	303145000	USD
CY2020	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	286845000	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	268442000	USD
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	40818000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	40494000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	40518000	USD
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	40672000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	42018000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	42419000	USD
CY2021	us-gaap	Interest Expense InterestExpense	845000	USD
CY2020	us-gaap	Interest Expense InterestExpense	1399000	USD
CY2019	us-gaap	Interest Expense InterestExpense	3135000	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	8225000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2021	us-gaap	Costs And Expenses CostsAndExpenses	1023377000	USD
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	980062000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	947345000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	50925000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	48155000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	49038000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	17774000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	26527000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	24772000	USD
CY2021	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	95202000	USD
CY2020	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	1707000	USD
CY2019	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	1975000	USD
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-13863000	USD
CY2020	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-23966000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	12230000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	150038000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	52423000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	88015000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10951000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10433000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20039000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	139087000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	41990000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	67976000	USD
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	497000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	119000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-235000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	138590000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	41871000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	68211000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.03
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.74
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.47
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.99
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.72
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.44
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15347129
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15306174
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15270154
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15416716
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15369523
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15360046
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.11
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.08
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.06
CY2021	us-gaap	Profit Loss ProfitLoss	139087000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	41990000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	67976000	USD
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-4171000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3352000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	6842000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	214000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	195000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	127000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-933000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	660000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	1410000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3452000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2497000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5305000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	497000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	119000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-235000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	135138000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	44368000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	73516000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	107607000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	147093000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	10407000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	9673000	USD
CY2021Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	113108000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	128590000	USD
CY2021Q4	us-gaap	Debt Securities Current DebtSecuritiesCurrent	35310000	USD
CY2020Q4	us-gaap	Debt Securities Current DebtSecuritiesCurrent	47762000	USD
CY2021Q4	us-gaap	Equity Securities Fv Ni Restricted EquitySecuritiesFvNiRestricted	26958000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni Restricted EquitySecuritiesFvNiRestricted	4680000	USD
CY2021Q4	nhc	Restricted Marketable Debt Securities Current RestrictedMarketableDebtSecuritiesCurrent	20727000	USD
CY2020Q4	nhc	Restricted Marketable Debt Securities Current RestrictedMarketableDebtSecuritiesCurrent	16601000	USD
CY2021Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	96124000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	89670000	USD
CY2021Q4	us-gaap	Inventory Net InventoryNet	8582000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	8781000	USD
CY2021Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	7362000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	2977000	USD
CY2021Q4	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	453000	USD
CY2020Q4	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	928000	USD
CY2021Q4	us-gaap	Assets Current AssetsCurrent	426638000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	456755000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1064337000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1030426000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	543341000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	510108000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	520996000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	520318000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	1729000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	1736000	USD
CY2021Q4	nhc	Restricted Marketable Debt Securities Noncurrent RestrictedMarketableDebtSecuritiesNoncurrent	116063000	USD
CY2020Q4	nhc	Restricted Marketable Debt Securities Noncurrent RestrictedMarketableDebtSecuritiesNoncurrent	125472000	USD
CY2021Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	4499000	USD
CY2020Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	4580000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	156116000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	179055000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	168295000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	21341000	USD
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	7038000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	0	USD
CY2021Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	0	USD
CY2020Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	12093000	USD
CY2021Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	2022000	USD
CY2021Q4	us-gaap	Self Insurance Reserve Noncurrent SelfInsuranceReserveNoncurrent	66914000	USD
CY2020Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	40782000	USD
CY2021Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	455762000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	385059000	USD
CY2021Q4	us-gaap	Assets Assets	1403396000	USD
CY2020Q4	us-gaap	Assets Assets	1362132000	USD
CY2021Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	22488000	USD
CY2020Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	21112000	USD
CY2021Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4695000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4423000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	27574000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	25451000	USD
CY2021Q4	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	106698000	USD
CY2020Q4	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	86183000	USD
CY2021Q4	us-gaap	Accounts Payable Other Current AccountsPayableOtherCurrent	17595000	USD
CY2020Q4	us-gaap	Accounts Payable Other Current AccountsPayableOtherCurrent	16454000	USD
CY2021Q4	us-gaap	Self Insurance Reserve Current SelfInsuranceReserveCurrent	31134000	USD
CY2020Q4	us-gaap	Self Insurance Reserve Current SelfInsuranceReserveCurrent	30953000	USD
CY2021Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	20059000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	21344000	USD
CY2021Q4	nhc	Provider Relief Funds ProviderReliefFunds	9443000	USD
CY2020Q4	nhc	Provider Relief Funds ProviderReliefFunds	16068000	USD
CY2021Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	15022000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	51253000	USD
CY2021Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	8493000	USD
CY2020Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	7987000	USD
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	263201000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	281228000	USD
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	5845000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	10540000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	128542000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	153604000	USD
CY2020Q4	us-gaap	Self Insurance Reserve Noncurrent SelfInsuranceReserveNoncurrent	68584000	USD
CY2021Q4	us-gaap	Contract With Customer Refund Liability Noncurrent ContractWithCustomerRefundLiabilityNoncurrent	7011000	USD
CY2020Q4	us-gaap	Contract With Customer Refund Liability Noncurrent ContractWithCustomerRefundLiabilityNoncurrent	7462000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	6852000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	14079000	USD
CY2021Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	16571000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	28375000	USD
CY2021Q4	us-gaap	Liabilities Liabilities	494936000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	563872000	USD
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	154000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	153000	USD
CY2021Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	232167000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	226943000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	669078000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	563024000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	1605000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	5057000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	903004000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	795177000	USD
CY2021Q4	us-gaap	Minority Interest MinorityInterest	5456000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	3083000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	908460000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	798260000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1403396000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1362132000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	139087000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	41990000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	67976000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	40672000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	42018000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	42419000	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	5111000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	12342000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	9744000	USD
CY2021	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	6314000	USD
CY2020	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	10050000	USD
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	3902000	USD
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-13863000	USD
CY2020	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-23966000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	12230000	USD
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	1042000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	195000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	127000	USD
CY2021	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	95202000	USD
CY2020	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	1707000	USD
CY2019	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	1975000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-0	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	2784000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-0	USD
CY2021	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	6294000	USD
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	10593000	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-4052000	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	8225000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	2620000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	2453000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	1878000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-4090000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-4529000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-4299000	USD
CY2021	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-0	USD
CY2020	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-0	USD
CY2019	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	2560000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-199000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1249000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-29000	USD
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3298000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-4727000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	287000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-2083000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	1429000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-856000	USD
CY2021	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	17292000	USD
CY2020	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	15948000	USD
CY2019	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	2208000	USD
CY2021	nhc	Increase Decrease In Due To Third Party Payors IncreaseDecreaseInDueToThirdPartyPayors	649000	USD
CY2020	nhc	Increase Decrease In Due To Third Party Payors IncreaseDecreaseInDueToThirdPartyPayors	1200000	USD
CY2019	nhc	Increase Decrease In Due To Third Party Payors IncreaseDecreaseInDueToThirdPartyPayors	-1000000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3923000	USD
CY2021	us-gaap	Increase Decrease In Self Insurance Reserve IncreaseDecreaseInSelfInsuranceReserve	-1489000	USD
CY2020	us-gaap	Increase Decrease In Self Insurance Reserve IncreaseDecreaseInSelfInsuranceReserve	3454000	USD
CY2019	us-gaap	Increase Decrease In Self Insurance Reserve IncreaseDecreaseInSelfInsuranceReserve	540000	USD
CY2021	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-6625000	USD
CY2020	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	16068000	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	0	USD
CY2021	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-36231000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	51253000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	0	USD
CY2021	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-1380000	USD
CY2020	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	5898000	USD
CY2019	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	780000	USD
CY2021	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-11862000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	7146000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	799000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	62394000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	203259000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	100103000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	39399000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	21873000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	26400000	USD
CY2021	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	6750000	USD
CY2019	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2021	nhc	Payments For Proceeds From Unconsolidated Investments PaymentsForProceedsFromUnconsolidatedInvestments	350000	USD
CY2020	nhc	Payments For Proceeds From Unconsolidated Investments PaymentsForProceedsFromUnconsolidatedInvestments	305000	USD
CY2019	nhc	Payments For Proceeds From Unconsolidated Investments PaymentsForProceedsFromUnconsolidatedInvestments	222000	USD
CY2021	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	28713000	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	6648000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	15589000	USD
CY2021	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	-0	USD
CY2020	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	425000	USD
CY2019	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	5462000	USD
CY2021	us-gaap	Proceeds From Collection Of Notes Receivable ProceedsFromCollectionOfNotesReceivable	8840000	USD
CY2020	us-gaap	Proceeds From Collection Of Notes Receivable ProceedsFromCollectionOfNotesReceivable	2483000	USD
CY2019	us-gaap	Proceeds From Collection Of Notes Receivable ProceedsFromCollectionOfNotesReceivable	1379000	USD
CY2021	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	108187000	USD
CY2020	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	84854000	USD
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	12471000	USD
CY2021	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	101920000	USD
CY2020	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	40994000	USD
CY2019	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	44500000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-65889000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-63878000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-14265000	USD
CY2021	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	0	USD
CY2020	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	40000000	USD
CY2019	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	0	USD
CY2021	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	-0	USD
CY2020	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	50000000	USD
CY2019	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	45000000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4423000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4166000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	158502000	USD
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	32030000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	31921000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	31208000	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	3441000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1756000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	2346000	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	836000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	53000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	872000	USD
CY2021	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	-964000	USD
CY2020	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	2488000	USD
CY2019	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	-468000	USD
CY2021	nhc	Entrance Fee Deposits Refunds EntranceFeeDepositsRefunds	-452000	USD
CY2020	nhc	Entrance Fee Deposits Refunds EntranceFeeDepositsRefunds	7000	USD
CY2019	nhc	Entrance Fee Deposits Refunds EntranceFeeDepositsRefunds	-623000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-35264000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-41889000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-79748000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-38759000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	97492000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	6090000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	61010000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	54920000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	119743000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	158502000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	61010000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	107607000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	147093000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	50334000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	12136000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	11409000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	10676000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	119743000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	158502000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	61010000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	845000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	1425000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	3118000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	22881000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	16524000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	20889000	USD
CY2021	us-gaap	Contribution Of Property ContributionOfProperty	2840000	USD
CY2020	us-gaap	Contribution Of Property ContributionOfProperty	0	USD
CY2019	us-gaap	Contribution Of Property ContributionOfProperty	0	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	734457000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	67976000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	468000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5305000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1878000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2346000	USD
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	872000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	31553000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	779069000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	41990000	USD
CY2020	nhc	Noncontrolling Interest Increase From Capital Contribution NoncontrollingInterestIncreaseFromCapitalContribution	2488000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2497000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2453000	USD
CY2020	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1756000	USD
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	53000	USD
CY2020	us-gaap	Dividends Common Stock DividendsCommonStock	31940000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	798260000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	139087000	USD
CY2021	nhc	Noncontrolling Interest Increase From Capital Contribution NoncontrollingInterestIncreaseFromCapitalContribution	1876000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3452000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2620000	USD
CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	3441000	USD
CY2021	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	836000	USD
CY2021	us-gaap	Dividends Common Stock DividendsCommonStock	32536000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	908460000	USD
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt;"><i>Use of Estimates</i></p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 36pt;">The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and could cause our reported net income to vary significantly from period to period, including but <em style="font: inherit;">not</em> limited to, the potential future effects of COVID-<em style="font: inherit;">19.</em></p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	3886000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	3339000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2403000	USD
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	6411000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	5672000	USD
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	20160000	USD
CY2020	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	19934000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	27008000	USD
CY2021	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	4497000	USD
CY2020	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	0	USD
CY2019	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	0	USD
CY2021Q4	us-gaap	Contract With Customer Refund Liability ContractWithCustomerRefundLiability	7011000	USD
CY2020Q4	us-gaap	Contract With Customer Refund Liability ContractWithCustomerRefundLiability	7462000	USD
CY2021Q4	us-gaap	Continuing Care Retirement Communities Advance Fees Obligation For Future Services Amount ContinuingCareRetirementCommunitiesAdvanceFeesObligationForFutureServicesAmount	2338000	USD
CY2021	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/><p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"/> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt;"><i>Concentration of Credit Risks</i></p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 36pt;">Our credit risks primarily relate to cash and cash equivalents, restricted cash and cash equivalents, accounts receivable, marketable securities, restricted marketable securities and notes receivable. Cash and cash equivalents are primarily held in bank accounts and overnight investments. Restricted cash and cash equivalents are primarily invested in commercial paper and certificates of deposit with financial institutions and other interest-bearing accounts. Accounts receivable consist primarily of amounts due from patients (funded through Medicare, Medicaid, other contractual programs and through private payors) and from other health care companies for management, accounting and other services. We perform continual credit evaluations of our clients and maintain appropriate allowances for doubtful accounts on any accounts receivable proving uncollectible, and continually monitor and adjust these allowances as necessary. Marketable securities and restricted marketable securities are held primarily in accounts with brokerage institutions. Notes receivable relate primarily to secured loans with health care facilities.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 36pt;">At any point in time we have funds in our operating accounts and restricted cash accounts that are with <em style="font: inherit;">third</em> party financial institutions. These balances in the U.S. <em style="font: inherit;"> may </em>exceed the Federal Deposit Insurance Corporation (“FDIC”) insurance limits. While we monitor the cash balances in our operating accounts, these cash and restricted cash balances could be impacted if the underlying financial institutions fail or could be subject to other adverse conditions in the financial markets.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt; text-indent: 36pt;">Our financial instruments, principally our notes receivable, are subject to the possibility of loss of the carrying values as a result of the failure of other parties to perform according to their contractual obligations. We obtain various collateral and other protective rights, and continually monitor these rights in order to reduce such possibilities of credit loss. We evaluate the need to provide reserves for potential credit losses on our financial instruments based on management's periodic review of the portfolio on an instrument-by-instrument basis.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2021	nhc	Government Assistance Stimulus Income Cares Act GovernmentAssistanceStimulusIncomeCaresAct	63360000	USD
CY2020	nhc	Government Assistance Stimulus Income Cares Act GovernmentAssistanceStimulusIncomeCaresAct	47505000	USD
CY2021Q4	nhc	Provider Relief Funds ProviderReliefFunds	9443000	USD
CY2020Q4	nhc	Provider Relief Funds ProviderReliefFunds	16068000	USD
CY2021	nhc	Proceeds From Medicare Accelerated And Advance Payment Program ProceedsFromMedicareAcceleratedAndAdvancePaymentProgram	51253000	USD
CY2021Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	15022000	USD
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	965542000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	931795000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	947872000	USD
CY2021	nhc	Revenue From Contract With Customer Including Assessed Tax Percentage RevenueFromContractWithCustomerIncludingAssessedTaxPercentage	1	pure
CY2020	nhc	Revenue From Contract With Customer Including Assessed Tax Percentage RevenueFromContractWithCustomerIncludingAssessedTaxPercentage	1	pure
CY2019	nhc	Revenue From Contract With Customer Including Assessed Tax Percentage RevenueFromContractWithCustomerIncludingAssessedTaxPercentage	1	pure
CY2021Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	15022000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	51253000	USD
CY2020	nhc	Paymens Received Government Assistance Medicare Accelerated And Advance Payment Program PaymensReceivedGovernmentAssistanceMedicareAcceleratedAndAdvancePaymentProgram	51253000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	51253000	USD
CY2021	nhc	Payments Recognized Government Assistance Medicare Accelerated And Advance Payment Program PaymentsRecognizedGovernmentAssistanceMedicareAcceleratedAndAdvancePaymentProgram	36231000	USD
CY2021Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	15022000	USD
CY2021	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	22717000	USD
CY2020	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	22768000	USD
CY2019	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	22641000	USD
CY2021	nhc	Management And Accounting Services Fees Revenue ManagementAndAccountingServicesFeesRevenue	17139000	USD
CY2020	nhc	Management And Accounting Services Fees Revenue ManagementAndAccountingServicesFeesRevenue	17147000	USD
CY2019	nhc	Management And Accounting Services Fees Revenue ManagementAndAccountingServicesFeesRevenue	18533000	USD
CY2021	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	5019000	USD
CY2020	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	5447000	USD
CY2019	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	6209000	USD
CY2021	nhc	Miscellaneous Revenue MiscellaneousRevenue	525000	USD
CY2020	nhc	Miscellaneous Revenue MiscellaneousRevenue	771000	USD
CY2019	nhc	Miscellaneous Revenue MiscellaneousRevenue	1128000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	2784000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	USD
CY2021	nhc	Other Revenues OtherRevenues	45400000	USD
CY2020	nhc	Other Revenues OtherRevenues	48917000	USD
CY2019	nhc	Other Revenues OtherRevenues	48511000	USD
CY2021	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	22609000	USD
CY2020	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	22019000	USD
CY2019	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	21937000	USD
CY2021	nhc	Operating Lease Variable Lease Income Expense OperatingLeaseVariableLeaseIncomeExpense	108000	USD
CY2020	nhc	Operating Lease Variable Lease Income Expense OperatingLeaseVariableLeaseIncomeExpense	749000	USD
CY2019	nhc	Operating Lease Variable Lease Income Expense OperatingLeaseVariableLeaseIncomeExpense	704000	USD
CY2021	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	22717000	USD
CY2020	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	22768000	USD
CY2019	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	22641000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	22999000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	22738000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	22730000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	22730000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	221000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	91418000	USD
CY2020Q4	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	6750000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	12342000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	9744000	USD
CY2021	nhc	Dividends And Other Net Realized Gains And Losses On Sales Of Securities DividendsAndOtherNetRealizedGainsAndLossesOnSalesOfSecurities	7998000	USD
CY2020	nhc	Dividends And Other Net Realized Gains And Losses On Sales Of Securities DividendsAndOtherNetRealizedGainsAndLossesOnSalesOfSecurities	8390000	USD
CY2019	nhc	Dividends And Other Net Realized Gains And Losses On Sales Of Securities DividendsAndOtherNetRealizedGainsAndLossesOnSalesOfSecurities	7840000	USD
CY2021	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	4665000	USD
CY2021	nhc	Government Assistance Stimulus Income Cares Act GovernmentAssistanceStimulusIncomeCaresAct	63360000	USD
CY2021	us-gaap	Revenues Revenues	1074302000	USD
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	629672000	USD
CY2021	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	303145000	USD
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	40818000	USD
CY2020	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	5795000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	7188000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	17774000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	26527000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	24772000	USD
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	965542000	USD
CY2021	nhc	Other Revenues OtherRevenues	45400000	USD
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	40672000	USD
CY2021	us-gaap	Interest Expense InterestExpense	845000	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	8225000	USD
CY2021	us-gaap	Costs And Expenses CostsAndExpenses	1023377000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	50925000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	17774000	USD
CY2021	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	95202000	USD
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-13863000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	150038000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	931795000	USD
CY2020	nhc	Other Revenues OtherRevenues	48917000	USD
CY2020	nhc	Government Assistance Stimulus Income Cares Act GovernmentAssistanceStimulusIncomeCaresAct	47505000	USD
CY2020	us-gaap	Revenues Revenues	1028217000	USD
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	609306000	USD
CY2020	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	286845000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	40494000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	42018000	USD
CY2020	us-gaap	Interest Expense InterestExpense	1399000	USD
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	980062000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	48155000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	26527000	USD
CY2020	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	1707000	USD
CY2020	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-23966000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	52423000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	947872000	USD
CY2019	nhc	Other Revenues OtherRevenues	48511000	USD
CY2019	us-gaap	Revenues Revenues	996383000	USD
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	592831000	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	268442000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	40518000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	42419000	USD
CY2019	us-gaap	Interest Expense InterestExpense	3135000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	947345000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	49038000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	24772000	USD
CY2019	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	1975000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	12230000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	88015000	USD
CY2013Q3	nhc	Facility Purchase Price FacilityPurchasePrice	49000000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	156116000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	179055000	USD
CY2021Q4	nhc	Lease Rightofuse Asset LeaseRightofuseAsset	164526000	USD
CY2020Q4	nhc	Lease Rightofuse Asset LeaseRightofuseAsset	191348000	USD
CY2021Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4695000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4423000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	27574000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	25451000	USD
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	5845000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	10540000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	128542000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	153604000	USD
CY2021Q4	nhc	Lease Liability LeaseLiability	166656000	USD
CY2020Q4	nhc	Lease Liability LeaseLiability	194018000	USD
CY2021Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y2M12D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y2M12D
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y2M12D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y2M12D
CY2021Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.060	pure
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.060	pure
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.060	pure
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.060	pure
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	3905000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	3906000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	3889000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	807000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1064000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1306000	USD
CY2021	nhc	Finance Lease Cost FinanceLeaseCost	4712000	USD
CY2020	nhc	Finance Lease Cost FinanceLeaseCost	4970000	USD
CY2019	nhc	Finance Lease Cost FinanceLeaseCost	5195000	USD
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	36079000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	35656000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	35881000	USD
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	3721000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	3617000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	3587000	USD
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1018000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1221000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1050000	USD
CY2021	nhc	Total Operating Lease Cost TotalOperatingLeaseCost	40818000	USD
CY2020	nhc	Total Operating Lease Cost TotalOperatingLeaseCost	40494000	USD
CY2019	nhc	Total Operating Lease Cost TotalOperatingLeaseCost	40518000	USD
CY2021	us-gaap	Lease Cost LeaseCost	45530000	USD
CY2020	us-gaap	Lease Cost LeaseCost	45464000	USD
CY2019	us-gaap	Lease Cost LeaseCost	45713000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	5200000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	35974000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	5200000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	35365000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	867000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	34883000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	0	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	34600000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	0	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	34381000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	5750000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	11267000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	180953000	USD
CY2021Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	727000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	24837000	USD
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	10540000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	156116000	USD
CY2021Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4695000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	27574000	USD
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	5845000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1176000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	361000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	138590000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	41871000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	68211000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	128542000	USD
CY2021	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	101920000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	36079000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	35656000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	35881000	USD
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	807000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1064000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1306000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4423000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4166000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3923000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15347129
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15306174
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15270154
CY2021	us-gaap	Net Income Loss NetIncomeLoss	138590000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	41871000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	68211000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.03
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.74
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15347129
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15306174
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15270154
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15416716
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15369523
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15360046
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.99
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.72
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.44
CY2021	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-13863000	USD
CY2020	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-23966000	USD
CY2021Q4	nhc	Marketable Securities Availableforsale Amortized Cost MarketableSecuritiesAvailableforsaleAmortizedCost	225705000	USD
CY2021Q4	us-gaap	Marketable Securities MarketableSecurities	312166000	USD
CY2020Q4	nhc	Marketable Securities Availableforsale Amortized Cost MarketableSecuritiesAvailableforsaleAmortizedCost	218396000	USD
CY2020Q4	us-gaap	Marketable Securities MarketableSecurities	323105000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	32718000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	32843000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	49694000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	49863000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	95293000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	96937000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	99143000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	103002000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	41580000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	41835000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	34326000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	36685000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	496000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	485000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	274000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	285000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	170087000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	172100000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	183437000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	189835000	USD
CY2021Q4	nhc	Equity Securities Fv Ni Gross Unrealized Gain EquitySecuritiesFvNiGrossUnrealizedGain	85394000	USD
CY2020Q4	nhc	Equity Securities Fv Ni Gross Unrealized Gain EquitySecuritiesFvNiGrossUnrealizedGain	98445000	USD
CY2021Q4	nhc	Equity Securities Fv Ni Gross Unrealized Loss EquitySecuritiesFvNiGrossUnrealizedLoss	946000	USD
CY2020Q4	nhc	Equity Securities Fv Ni Gross Unrealized Loss EquitySecuritiesFvNiGrossUnrealizedLoss	134000	USD
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	12230000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3189000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	40994000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	44500000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3918000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	2844000	USD
CY2021	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	1042000	USD
CY2020	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	195000	USD
CY2019	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	127000	USD
CY2021Q4	us-gaap	Land Land	66267000	USD
CY2020Q4	us-gaap	Land Land	64385000	USD
CY2021Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	122391000	USD
CY2020Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	125889000	USD
CY2021Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	654656000	USD
CY2020Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	641367000	USD
CY2021Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	185320000	USD
CY2020Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	180463000	USD
CY2021Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	35703000	USD
CY2020Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	18322000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1064337000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1030426000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	543341000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	510108000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	520996000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	520318000	USD
CY2021Q4	nhc	Cost To Complete Construction In Progress CostToCompleteConstructionInProgress	5360000	USD
CY2021	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2018Q4	us-gaap	Goodwill Goodwill	20995000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	6000
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	72.94
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	453000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	13021000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	20995000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	346000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	21341000	USD
CY2021	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	146954000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	168295000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	15072000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	19054000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	13356000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1164000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2337000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1101000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	16236000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	21391000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	14457000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3866000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-8349000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	4048000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1419000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2609000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1534000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5285000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-10958000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	5582000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10951000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10433000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20039000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	1803000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	1764000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	9663000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	11803000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	5610000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	4125000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	527000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1063000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	8019000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	4215000	USD
CY2021Q4	nhc	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	39629000	USD
CY2020Q4	nhc	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	45486000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1991000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	698000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	67242000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	69154000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	-0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	-0	USD
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	67242000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	69154000	USD
CY2021Q4	nhc	Deferred Tax Liabilities Unrealized Gains On Marketable Securities DeferredTaxLiabilitiesUnrealizedGainsOnMarketableSecurities	22401000	USD
CY2020Q4	nhc	Deferred Tax Liabilities Unrealized Gains On Marketable Securities DeferredTaxLiabilitiesUnrealizedGainsOnMarketableSecurities	27040000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2040000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2042000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	2708000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	2360000	USD
CY2021Q4	nhc	Deferred Tax Liabilities Book Basis In Excess Of Tax Basis Of Securities DeferredTaxLiabilitiesBookBasisInExcessOfTaxBasisOfSecurities	2822000	USD
CY2020Q4	nhc	Deferred Tax Liabilities Book Basis In Excess Of Tax Basis Of Securities DeferredTaxLiabilitiesBookBasisInExcessOfTaxBasisOfSecurities	2514000	USD
CY2021Q4	nhc	Deferred Tax Liabilities Long Term Investments DeferredTaxLiabilitiesLongTermInvestments	4494000	USD
CY2020Q4	nhc	Deferred Tax Liabilities Long Term Investments DeferredTaxLiabilitiesLongTermInvestments	3791000	USD
CY2021Q4	nhc	Deferred Tax Liabilities Operating Lease Assets DeferredTaxLiabilitiesOperatingLeaseAssets	39629000	USD
CY2020Q4	nhc	Deferred Tax Liabilities Operating Lease Assets DeferredTaxLiabilitiesOperatingLeaseAssets	45486000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	74094000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	83233000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	6852000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	14079000	USD
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	31508000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	11009000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	18483000	USD
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1113000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1631000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3850000	USD
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	19758000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	-0	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	-0	USD
CY2021	nhc	Income Tax Reconciliation Return To Provision IncomeTaxReconciliationReturnToProvision	-0	USD
CY2020	nhc	Income Tax Reconciliation Return To Provision IncomeTaxReconciliationReturnToProvision	382000	USD
CY2019	nhc	Income Tax Reconciliation Return To Provision IncomeTaxReconciliationReturnToProvision	793000	USD
CY2021	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-158000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	166000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	512000	USD
CY2021	nhc	Income Tax Reconciliation Expiration Of Statute Of Limitations IncomeTaxReconciliationExpirationOfStatuteOfLimitations	1901000	USD
CY2020	nhc	Income Tax Reconciliation Expiration Of Statute Of Limitations IncomeTaxReconciliationExpirationOfStatuteOfLimitations	2366000	USD
CY2019	nhc	Income Tax Reconciliation Expiration Of Statute Of Limitations IncomeTaxReconciliationExpirationOfStatuteOfLimitations	2064000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	147000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	375000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	51000	USD
CY2021	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-20557000	USD
CY2020	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-576000	USD
CY2019	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	1556000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10951000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10433000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20039000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-1469000	USD
CY2020	nhc	Effective Income Tax Rate Reconciliation Benefit Resulting From Expiration Of Applicable Statute Limitations Amount EffectiveIncomeTaxRateReconciliationBenefitResultingFromExpirationOfApplicableStatuteLimitationsAmount	2366000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3940000	USD
CY2021Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	1213000	USD
CY2021	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	-324000	USD
CY2020	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	-695000	USD
CY2019	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	38000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2844000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	677000	USD
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	374926
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	72.95
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	377899	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	677000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	3960000	USD
CY2021Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	1041000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0021	pure
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0087	pure
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0230	pure
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.349	pure
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.201	pure
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.174	pure
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P2Y2M12D
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P2Y2M12D
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P2Y3M18D
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0300	pure
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0291	pure
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0273	pure
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1163381
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	71.16
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	77316
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	77.89
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	346168
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	71.57
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	85000
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	72.94
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	809529
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	71.24
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	104057
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	73.98
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	43630
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	63.37
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	3000
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	72.94
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	866956
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	72.11
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	55706
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	172686
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	69.60
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	70.80
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	541736
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	71.39
CY2021Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	377899	USD
CY2020Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
CY2021Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	1.4
CY2021Q4	us-gaap	Self Insurance Reserve SelfInsuranceReserve	98048000	USD
CY2020Q4	us-gaap	Self Insurance Reserve SelfInsuranceReserve	99537000	USD

Files In Submission

Name	View Source	Status
0001437749-22-003787-index-headers.html	Edgar Link	pending
0001437749-22-003787-index.html	Edgar Link	pending
0001437749-22-003787.txt	Edgar Link	pending
0001437749-22-003787-xbrl.zip	Edgar Link	pending
ex_333669.htm	Edgar Link	pending
ex_333670.htm	Edgar Link	pending
ex_333671.htm	Edgar Link	pending
ex_333672.htm	Edgar Link	pending
ex_333673.htm	Edgar Link	pending
ex_333674.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
graph01.jpg	Edgar Link	pending
logobanner.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
nhc-20211231.xsd	Edgar Link	pending
nhc-20211231_cal.xml	Edgar Link	unprocessable
nhc-20211231_def.xml	Edgar Link	unprocessable
nhc-20211231_lab.xml	Edgar Link	unprocessable
nhc-20211231_pre.xml	Edgar Link	unprocessable
nhc20211231_10k.htm	Edgar Link	pending
nhc20211231_10k_htm.xml	Edgar Link	completed
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$NHC
NATIONAL HEALTHCARE CORP Stock $nhc

2021 Q4 Form 10-K Financial Statement

#000143774922003787 Filed on February 18, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NHC NATIONAL HEALTHCARE CORP Stock $nhc

2021 Q4 Form 10-K Financial Statement

#000143774922003787 Filed on February 18, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NHC
NATIONAL HEALTHCARE CORP Stock $nhc