$GRBK
Green Brick Partners, Inc. Stock $grbk

$grbk Overview Financials Valuation SEC Filings Company Website

2020 Form 10-K Financial Statement

#000137367021000016 Filed on March 08, 2021

Income Statement

Concept	2020	2019 Q4	2019
Revenue	$976.0M	$230.1M	$791.7M
YoY Change	23.29%	24.3%	26.94%
Cost Of Revenue	$741.4M	$181.4M	$622.6M
YoY Change	19.09%	41.06%	32.62%
Gross Profit	$234.6M	$48.70M	$169.1M
YoY Change	38.75%	31.66%	9.65%
Gross Profit Margin	24.04%	21.16%	21.36%
Selling, General & Admin	$112.1M	$27.60M	$97.78M
YoY Change	14.69%	-30.83%	22.16%
% of Gross Profit	47.8%	56.67%	57.83%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$3.666M	$640.0K	$3.079M
YoY Change	19.06%	-43.86%	4.62%
% of Gross Profit	1.56%	1.31%	1.82%
Operating Expenses	$112.1M	$30.70M	$97.78M
YoY Change	14.69%	-26.2%	22.16%
Operating Profit	$122.5M	$18.00M	$71.31M
YoY Change	71.75%	-490.29%	-0.7%
Interest Expense	$0.00	$2.200M	$0.00
YoY Change		214.29%
% of Operating Profit	0.0%	12.22%	0.0%
Other Income/Expense, Net	$4.057M	$2.300M	$8.119M
YoY Change	-50.03%	-1250.0%	318.07%
Pretax Income	$142.8M	$22.60M	$84.33M
YoY Change	69.35%	9.18%	3.25%
Income Tax	$25.02M	$5.000M	$20.03M
% Of Pretax Income	17.52%	22.12%	23.75%
Net Earnings	$113.7M	$15.90M	$58.66M
YoY Change	93.83%	19.07%	13.62%
Net Earnings / Revenue	11.65%	6.91%	7.41%
Basic Earnings Per Share	$2.25		$1.16
Diluted Earnings Per Share	$2.24	$314.2K	$1.16
COMMON SHARES
Basic Shares Outstanding	50.57M shares	50.49M shares	50.53M shares
Diluted Shares Outstanding	50.80M shares		50.64M shares

Balance Sheet

Concept	2020	2019 Q4	2019
SHORT-TERM ASSETS
Cash & Short-Term Investments	$19.50M	$33.30M	$33.30M
YoY Change	-41.44%	-13.05%	-13.05%
Cash & Equivalents	$19.50M	$33.27M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory	$844.6M	$753.6M	$753.6M
Prepaid Expenses
Receivables	$5.200M	$4.700M	$4.700M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$869.3M	$791.6M	$791.6M
YoY Change	9.82%	11.16%	11.16%
LONG-TERM ASSETS
Property, Plant & Equipment	$6.100M	$4.309M	$7.800M
YoY Change	-21.79%	-8.12%	65.96%
Goodwill		$680.0K
YoY Change		0.0%
Intangibles		$707.0K
YoY Change		-17.41%
Long-Term Investments	$46.40M	$30.29M	$30.30M
YoY Change	53.14%	49.46%	49.26%
Other Assets	$29.50M	$19.70M	$19.70M
YoY Change	49.75%	-1.01%	-1.01%
Total Long-Term Assets	$119.5M	$83.94M	$83.90M
YoY Change	42.43%	16.7%	16.69%
TOTAL ASSETS
Total Short-Term Assets	$869.3M	$791.6M	$791.6M
Total Long-Term Assets	$119.5M	$83.94M	$83.90M
Total Assets	$988.8M	$875.5M	$875.5M
YoY Change	12.94%	11.67%	11.67%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$24.50M	$30.00M	$30.00M
YoY Change	-18.33%	14.94%	14.94%
Accrued Expenses	$43.00M	$28.20M	$28.20M
YoY Change	52.48%	-3.42%	-3.42%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$105.6M	$82.20M	$82.20M
YoY Change	28.47%	-5.84%	-5.84%
LONG-TERM LIABILITIES
Long-Term Debt	$233.4M	$251.7M	$251.7M
YoY Change	-7.27%	20.49%	20.49%
Other Long-Term Liabilities	$400.0K	$5.300M	$5.300M
YoY Change	-92.45%	140.91%	140.91%
Total Long-Term Liabilities	$233.8M	$257.0M	$257.0M
YoY Change	-9.03%	21.74%	21.74%
TOTAL LIABILITIES
Total Short-Term Liabilities	$105.6M	$82.20M	$82.20M
Total Long-Term Liabilities	$233.8M	$257.0M	$257.0M
Total Liabilities	$348.6M	$325.5M	$352.4M
YoY Change	-1.08%	12.31%	11.62%
SHAREHOLDERS EQUITY
Retained Earnings		$235.0M
YoY Change		32.39%
Common Stock		$291.3M
YoY Change		-0.17%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$3.167M
YoY Change		222.83%
Treasury Stock Shares
Shareholders Equity	$640.2M	$523.2M	$523.2M
YoY Change
Total Liabilities & Shareholders Equity	$988.8M	$875.5M	$875.5M
YoY Change	12.94%	11.67%	11.67%

Cashflow Statement

Concept	2020	2019 Q4	2019
OPERATING ACTIVITIES
Net Income	$113.7M	$15.90M	$58.66M
YoY Change	93.83%	19.07%	13.62%
Depreciation, Depletion And Amortization	$3.666M	$640.0K	$3.079M
YoY Change	19.06%	-43.86%	4.62%
Cash From Operating Activities	$35.14M	-$820.0K	-$22.05M
YoY Change	-259.32%	-28.7%	-44.14%
INVESTING ACTIVITIES
Capital Expenditures	$2.903M	-$730.0K	$2.579M
YoY Change	12.56%	-49.31%	-19.68%
Acquisitions	$0.00		$0.00
YoY Change			-100.0%
Other Investing Activities	-$10.43M	-$5.300M	-$5.300M
YoY Change	96.79%		-80.81%
Cash From Investing Activities	-$13.33M	-$6.030M	-$7.879M
YoY Change	69.23%	315.86%	-74.44%
FINANCING ACTIVITIES
Cash Dividend Paid	$0.00
YoY Change
Common Stock Issuance & Retirement, Net	$0.00		$2.186M
YoY Change	-100.0%		122.83%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$25.85M	3.310M	$25.86M
YoY Change	-199.96%	-601.52%	-63.96%
NET CHANGE
Cash From Operating Activities	$35.14M	-820.0K	-$22.05M
Cash From Investing Activities	-$13.33M	-6.030M	-$7.879M
Cash From Financing Activities	-$25.85M	3.310M	$25.86M
Net Change In Cash	-$4.050M	-3.540M	-$4.070M
YoY Change	-0.49%	8.59%	-377.63%
FREE CASH FLOW
Cash From Operating Activities	$35.14M	-$820.0K	-$22.05M
Capital Expenditures	$2.903M	-$730.0K	$2.579M
Free Cash Flow	$32.23M	-$90.00K	-$24.63M
YoY Change	-230.85%	-131.03%	-42.3%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001373670
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-33530
CY2020	dei	Entity Registrant Name EntityRegistrantName	Green Brick Partners, Inc.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	20-5952523
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	2805 Dallas Pkwy
CY2020	dei	Entity Address Address Line2 EntityAddressAddressLine2	Ste 400
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Plano
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	75093
CY2020	dei	City Area Code CityAreaCode	(469)
CY2020	dei	Local Phone Number LocalPhoneNumber	573-6755
CY2020	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
CY2020	dei	Trading Symbol TradingSymbol	GRBK
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	true
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	283118968	USD
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CY2020Q4	dei	Entity Number Of Employees EntityNumberOfEmployees	440	employee
CY2020Q4	us-gaap	Cash Cash	19479000	USD
CY2019Q4	us-gaap	Cash Cash	33269000	USD
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	14156000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	4416000	USD
CY2020Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	5224000	USD
CY2019Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	4720000	USD
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CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	46443000	USD
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CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	2538000	USD
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CY2019Q4	us-gaap	Unsecured Debt UnsecuredDebt	73406000	USD
CY2020Q4	us-gaap	Notes Payable NotesPayable	2125000	USD
CY2019Q4	us-gaap	Notes Payable NotesPayable	0	USD
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CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	404000	USD
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CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	981000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	981000	USD
CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	5000	USD
CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	5000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	10747000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	10747000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	51623000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	51623000	USD
CY2018	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	11332000	USD
CY2018	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	62955000	USD
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	50719884	shares
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	507000	USD
CY2018Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	136756	shares
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	981000	USD
CY2018Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	291299000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	177526000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	468351000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	17281000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	485632000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	236000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	236000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Stock Options Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition	236000	USD
CY2019	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	219181	shares
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1466000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1466000	USD
CY2019	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	59116	shares
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	544000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	544000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	489000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	489000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	489000	USD
CY2019	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	255183	shares
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2186000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2186000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2186000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	3600000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	3600000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	10993000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	58656000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	58656000	USD
CY2019	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	2184000	USD
CY2019	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	60840000	USD
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	50879949	shares
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	509000	USD
CY2019Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	391939	shares
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	3167000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	290799000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	235027000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	523168000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	13227000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	536395000	USD
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	50879949	shares
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	509000	USD
CY2019Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	391939	shares
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	3167000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	290799000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	235027000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	523168000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	13227000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	536395000	USD
CY2020	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	249617	shares
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1600000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1600000	USD
CY2020	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	75708	shares
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	592000	USD
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	592000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	497000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	497000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	497000	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	400000	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	400000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	5251000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	5251000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	113693000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	113693000	USD
CY2020	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	1727000	USD
CY2020	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	115420000	USD
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	51053858	shares
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	511000	USD
CY2020Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	391939	shares
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	3167000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	293242000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	349656000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	640242000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	9167000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	649409000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	117797000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	64302000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	64535000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	3666000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	3079000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2943000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	2097000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	2191000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	1774000	USD
CY2020	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	368000	USD
CY2019	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	4906000	USD
CY2018	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	1693000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-114000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1237000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14712000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	16654000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	9809000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	7259000	USD
CY2020	grbk	Allowances For Option Deposits And Pre Acquisition Costs AllowancesForOptionDepositsAndPreAcquisitionCosts	1513000	USD
CY2019	grbk	Allowances For Option Deposits And Pre Acquisition Costs AllowancesForOptionDepositsAndPreAcquisitionCosts	884000	USD
CY2018	grbk	Allowances For Option Deposits And Pre Acquisition Costs AllowancesForOptionDepositsAndPreAcquisitionCosts	663000	USD
CY2020	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	10936000	USD
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	5084000	USD
CY2018	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	4623000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	504000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-122000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	3029000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	90345000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	83970000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	129291000	USD
CY2020	us-gaap	Increase Decrease In Earnest Money Deposits Outstanding IncreaseDecreaseInEarnestMoneyDepositsOutstanding	9069000	USD
CY2019	us-gaap	Increase Decrease In Earnest Money Deposits Outstanding IncreaseDecreaseInEarnestMoneyDepositsOutstanding	-2107000	USD
CY2018	us-gaap	Increase Decrease In Earnest Money Deposits Outstanding IncreaseDecreaseInEarnestMoneyDepositsOutstanding	-2119000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3739000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	2409000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3404000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-5523000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	3953000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-483000	USD
CY2020	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	15760000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-4384000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	9470000	USD
CY2020	us-gaap	Payment For Contingent Consideration Liability Operating Activities PaymentForContingentConsiderationLiabilityOperatingActivities	5267000	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Operating Activities PaymentForContingentConsiderationLiabilityOperatingActivities	1332000	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Operating Activities PaymentForContingentConsiderationLiabilityOperatingActivities	0	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	14177000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-8024000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	1458000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	35099000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-22063000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-39476000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	26861000	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	10431000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	5300000	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	755000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2867000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2569000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3211000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-13298000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-7869000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-30827000	USD
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	354500000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	224000000	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	165000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	37500000	USD
CY2019	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	75000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	412500000	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	260000000	USD
CY2018	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	70000000	USD
CY2020	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	10714000	USD
CY2019	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	USD
CY2018	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	USD
CY2020	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	8590000	USD
CY2019	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	0	USD
CY2018	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	10226000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	527000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1974000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	870000	USD
CY2020	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	514000	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	592000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	544000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	412000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2186000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	981000	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	400000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	3600000	USD
CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	5000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1505000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-527000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	5251000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	10993000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	10747000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-25851000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	25862000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	71769000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-4050000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-4070000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	1466000	USD
CY2019Q4	us-gaap	Cash Cash	33269000	USD
CY2018Q4	us-gaap	Cash Cash	38315000	USD
CY2017Q4	us-gaap	Cash Cash	36684000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	4416000	USD
CY2018Q4	us-gaap	Restricted Cash RestrictedCash	3440000	USD
CY2017Q4	us-gaap	Restricted Cash RestrictedCash	3605000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	37685000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	41755000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	40289000	USD
CY2020Q4	us-gaap	Cash Cash	19479000	USD
CY2019Q4	us-gaap	Cash Cash	33269000	USD
CY2018Q4	us-gaap	Cash Cash	38315000	USD
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	14156000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	4416000	USD
CY2018Q4	us-gaap	Restricted Cash RestrictedCash	3440000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	33635000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	37685000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	41755000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	0	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	0	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	0	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	20541000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	14313000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	4611000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%;text-decoration:underline">Use of Estimates</span></div><div style="text-indent:18pt"><span><br/></span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of the consolidated financial statements in conformity with GAAP requires management of the Company to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes, including the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates.</span></div>
CY2020	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	ReclassificationsCertain prior period amounts have been reclassified to conform to the current period presentation with no impact to net income in any period.
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	0	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	100000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	200000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	0.1	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	85000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	85000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	85000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	85000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	85000	USD
	grbk	Contingent Consideration Earned ContingentConsiderationEarned	1800000	USD
	us-gaap	Distribution Made To Limited Liability Company Llc Member Cash Distributions Paid DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid	500000	USD
CY2020	grbk	Contingent Consideration Earned ContingentConsiderationEarned	5300000	USD
CY2020	us-gaap	Distribution Made To Limited Liability Company Llc Member Cash Distributions Paid DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid	1500000	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Arrangements Range Of Outcomes Value High BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh	0.0	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	13611000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	8531000	USD
CY2020	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	2377000	USD
CY2019	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	3462000	USD
CY2020	us-gaap	Temporary Equity Interest In Subsidiary Earnings TemporaryEquityInterestInSubsidiaryEarnings	1505000	USD
CY2019	us-gaap	Temporary Equity Interest In Subsidiary Earnings TemporaryEquityInterestInSubsidiaryEarnings	527000	USD
CY2020	us-gaap	Temporary Equity Accretion To Redemption Value TemporaryEquityAccretionToRedemptionValue	940000	USD
CY2019	us-gaap	Temporary Equity Accretion To Redemption Value TemporaryEquityAccretionToRedemptionValue	2145000	USD
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	13543000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Common Carrying Amount RedeemableNoncontrollingInterestEquityCommonCarryingAmount	13611000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	3600000	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	400000	USD
CY2020Q4	grbk	Equity Method Investment Board Seats EquityMethodInvestmentBoardSeats	3
CY2020Q4	grbk	Finished Homesand Homesunder Construction FinishedHomesandHomesunderConstruction	356706000	USD
CY2019Q4	grbk	Finished Homesand Homesunder Construction FinishedHomesandHomesunderConstruction	314966000	USD
CY2020Q4	us-gaap	Inventory Real Estate Land And Land Development Costs InventoryRealEstateLandAndLandDevelopmentCosts	482371000	USD
CY2019Q4	us-gaap	Inventory Real Estate Land And Land Development Costs InventoryRealEstateLandAndLandDevelopmentCosts	437553000	USD
CY2020Q4	us-gaap	Inventory Land Held For Sale InventoryLandHeldForSale	5558000	USD
CY2019Q4	us-gaap	Inventory Land Held For Sale InventoryLandHeldForSale	1048000	USD
CY2020Q4	us-gaap	Inventory Real Estate InventoryRealEstate	844635000	USD
CY2019Q4	us-gaap	Inventory Real Estate InventoryRealEstate	753567000	USD
CY2019Q4	us-gaap	Real Estate Inventory Capitalized Interest Costs RealEstateInventoryCapitalizedInterestCosts	18596000	USD
CY2018Q4	us-gaap	Real Estate Inventory Capitalized Interest Costs RealEstateInventoryCapitalizedInterestCosts	14780000	USD
CY2017Q4	us-gaap	Real Estate Inventory Capitalized Interest Costs RealEstateInventoryCapitalizedInterestCosts	10474000	USD
CY2020	us-gaap	Real Estate Inventory Capitalized Interest Costs Incurred RealEstateInventoryCapitalizedInterestCostsIncurred	9823000	USD
CY2019	us-gaap	Real Estate Inventory Capitalized Interest Costs Incurred RealEstateInventoryCapitalizedInterestCostsIncurred	12140000	USD
CY2018	us-gaap	Real Estate Inventory Capitalized Interest Costs Incurred RealEstateInventoryCapitalizedInterestCostsIncurred	9003000	USD
CY2020	us-gaap	Real Estate Inventory Capitalized Interest Costs Cost Of Sales1 RealEstateInventoryCapitalizedInterestCostsCostOfSales1	10899000	USD
CY2019	us-gaap	Real Estate Inventory Capitalized Interest Costs Cost Of Sales1 RealEstateInventoryCapitalizedInterestCostsCostOfSales1	8324000	USD
CY2018	us-gaap	Real Estate Inventory Capitalized Interest Costs Cost Of Sales1 RealEstateInventoryCapitalizedInterestCostsCostOfSales1	4697000	USD
CY2020Q4	us-gaap	Real Estate Inventory Capitalized Interest Costs RealEstateInventoryCapitalizedInterestCosts	17520000	USD
CY2019Q4	us-gaap	Real Estate Inventory Capitalized Interest Costs RealEstateInventoryCapitalizedInterestCosts	18596000	USD
CY2018Q4	us-gaap	Real Estate Inventory Capitalized Interest Costs RealEstateInventoryCapitalizedInterestCosts	14780000	USD
CY2020Q4	grbk	Inventorywithpotentialindicatorsofimpairment Inventorywithpotentialindicatorsofimpairment	2800000	USD
CY2019	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	100000	USD
CY2018	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	100000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	46443000	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	30294000	USD
CY2019Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	2000000.0	USD
CY2019Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	2000000.0	USD
CY2020Q4	us-gaap	Variable Interest Entity Entity Maximum Loss Exposure Amount VariableInterestEntityEntityMaximumLossExposureAmount	7300000	USD
CY2019Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	2000000.0	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	16654000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	9809000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	7259000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	11129000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	10550000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7534000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	6241000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3595000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4309000	USD
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	us-gaap	Depreciation Depreciation	3600000	USD
CY2019	us-gaap	Depreciation Depreciation	2900000	USD
CY2018	us-gaap	Depreciation Depreciation	2700000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	11434000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	35585000	USD
CY2019Q4	us-gaap	Line Of Credit LineOfCredit	164642000	USD
CY2020Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	33500000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	60981000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	12500000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	12500000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	87500000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	220500000	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	1313000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	1358000	USD
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	106687000	USD
CY2019Q3	us-gaap	Senior Notes SeniorNotes	75000000.0	USD
CY2019Q3	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0400
CY2019Q3	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	73300000	USD
CY2019Q3	us-gaap	Debt Instrument Fee Amount DebtInstrumentFeeAmount	1500000	USD
CY2019Q3	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	200000	USD
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	51053858	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	50661919	shares
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2020Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	30000000.0	USD
CY2018Q4	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	136756	shares
CY2018Q4	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1000000.0	USD
CY2019Q1	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	7862	shares
CY2019Q1	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	100000	USD
CY2019Q2	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	39320	shares
CY2019Q2	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	300000	USD
CY2019Q3	us-gaap	Stock Repurchase Program Expiration Date StockRepurchaseProgramExpirationDate	2019-08-05
CY2019Q3	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	144584	shares
CY2019Q3	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1200000	USD
CY2019Q3	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	63417	shares
CY2019Q3	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	600000	USD
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	2350956	shares
CY2018	grbk	Sharebased Compensation Arrangementby Sharebased Payment Award Maximum Amounttobe Paidto Individual SharebasedCompensationArrangementbySharebasedPaymentAwardMaximumAmounttobePaidtoIndividual	2000000.0	USD
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	1482794	shares
CY2020	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	75708	shares
CY2019	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	59116	shares
CY2018	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	39228	shares
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	600000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	500000	USD
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	400000	USD
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	38000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	10.25
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	140000	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	10.45
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	144000	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	10.03
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	0	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	0
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	34000	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	12.00
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	219000	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	9.14
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	194000	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	9.67
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	0	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	0
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	59000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	9.05
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	250000	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	8.63
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	264000	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	8.10
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	0	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	0
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	45000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	12.33
CY2014Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod	P10Y
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	500000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	7.49
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod		shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	0
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	500000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	7.49
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P3Y9M25D
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	7735000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	500000	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	7.49
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P3Y9M25D
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	7735000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2100000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	2200000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	1800000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	400000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	500000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	400000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	2100000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	1900000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	1400000	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	38131000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	23954000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	20078000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	12398000	USD
CY2020	us-gaap	Contract With Customer Performance Obligation Satisfied In Previous Period ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod	0	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	16700000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	14825000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1826000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	16651000	USD
CY2020	us-gaap	Revenue Practical Expedient Remaining Performance Obligation Description RevenuePracticalExpedientRemainingPerformanceObligationDescription	Our contracts with homebuyers have a duration of less than one year. As such, the Company uses the practical expedient as allowed under ASC 606 and has not disclosed the transaction price allocated to remaining performance obligations as of the end of the reporting period.
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	us-gaap	Revenues Revenues	976021000	USD
CY2019	us-gaap	Revenues Revenues	791660000	USD
CY2018	us-gaap	Revenues Revenues	623647000	USD
CY2020	us-gaap	Gross Profit GrossProfit	234604000	USD
CY2019	us-gaap	Gross Profit GrossProfit	169082000	USD
CY2018	us-gaap	Gross Profit GrossProfit	154202000	USD
CY2020	us-gaap	Interest Expense InterestExpense	0	USD
CY2019	us-gaap	Interest Expense InterestExpense	0	USD
CY2018	us-gaap	Interest Expense InterestExpense	0	USD
CY2020	us-gaap	Results Of Operations Income Before Income Taxes ResultsOfOperationsIncomeBeforeIncomeTaxes	142813000	USD
CY2019	us-gaap	Results Of Operations Income Before Income Taxes ResultsOfOperationsIncomeBeforeIncomeTaxes	84329000	USD
CY2018	us-gaap	Results Of Operations Income Before Income Taxes ResultsOfOperationsIncomeBeforeIncomeTaxes	81671000	USD
CY2020Q4	us-gaap	Inventory Operative Builders InventoryOperativeBuilders	844635000	USD
CY2019Q4	us-gaap	Inventory Operative Builders InventoryOperativeBuilders	753567000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	680000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	680000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	20968000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	15980000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-569000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4162000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2810000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2993000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	25130000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	18790000	USD
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CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1237000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14712000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	25016000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20027000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17136000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	29991000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2706000	USD
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CY2020	us-gaap	Income Tax Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	862000	USD
CY2019	us-gaap	Income Tax Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	1252000	USD
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CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3606000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1940000	USD
CY2020	grbk	Writeoffofstatenetoperatinglosses Writeoffofstatenetoperatinglosses	0	USD
CY2019	grbk	Writeoffofstatenetoperatinglosses Writeoffofstatenetoperatinglosses	1063000	USD
CY2018	grbk	Writeoffofstatenetoperatinglosses Writeoffofstatenetoperatinglosses	283000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
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CY2020	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	8088000	USD
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CY2018	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	0	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	369000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	864000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	788000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	25016000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20027000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17136000	USD
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CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.237
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.210
CY2020	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	8100000	USD
CY2020Q4	grbk	Deferred Tax Assets Basisin Partnership DeferredTaxAssetsBasisinPartnership	8163000	USD
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CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Contingencies DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies	1444000	USD
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CY2019Q4	grbk	Deferred Tax Assets Operating Leases Liabilities DeferredTaxAssetsOperatingLeasesLiabilities	832000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	392000	USD
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CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	349000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	191000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	16454000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	16609000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
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CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	16454000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	16609000	USD
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CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	125000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	110000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1078000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1347000	USD
CY2019Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	13700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1063000	USD
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CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	900000	USD
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CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	600000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	113693000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	58656000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	51623000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50568000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50530000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50652000	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.25
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CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	99000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50568000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50530000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50652000	shares
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	227000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	106000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50795000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50636000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50751000	shares
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.24
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.16
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.02
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	10000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	14000	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	8000	shares
CY2020Q4	us-gaap	Lines Of Credit Fair Value Disclosure LinesOfCreditFairValueDisclosure	125200000	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Liability Measurement Input BusinessCombinationContingentConsiderationLiabilityMeasurementInput	0.165
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	5267000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	5267000	USD
CY2020	us-gaap	Payment For Contingent Consideration Liability Operating Activities PaymentForContingentConsiderationLiabilityOperatingActivities	5267000	USD
CY2020	us-gaap	Payment For Contingent Consideration Liability Operating Activities PaymentForContingentConsiderationLiabilityOperatingActivities	5267000	USD
CY2020	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	368000	USD
CY2020	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	368000	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	368000	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	368000	USD
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	9800000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	14400000	USD
CY2020	us-gaap	Standard Product Warranty Accrual Preexisting Increase Decrease StandardProductWarrantyAccrualPreexistingIncreaseDecrease	-26000	USD
CY2019	us-gaap	Standard Product Warranty Accrual Preexisting Increase Decrease StandardProductWarrantyAccrualPreexistingIncreaseDecrease	37000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	1300000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	1300000	USD
CY2019	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	1200000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0485
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	1093000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	816000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1216000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	86000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	87000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	66000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	3364000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	773000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	2591000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	400000	USD

Files In Submission

Name	View Source	Status
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0001373670-21-000016-index.html	Edgar Link	pending
0001373670-21-000016.txt	Edgar Link	pending
0001373670-21-000016-xbrl.zip	Edgar Link	pending
exhibit21listofsubsidiarie.htm	Edgar Link	pending
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exhibit311certificationofc.htm	Edgar Link	pending
exhibit312certificationofc.htm	Edgar Link	pending
exhibit321certificationofc.htm	Edgar Link	pending
exhibit322certificationofc.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
grbk-20201231.htm	Edgar Link	pending
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grbk-20201231_cal.xml	Edgar Link	unprocessable
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R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R9999.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$GRBK
Green Brick Partners, Inc. Stock $grbk

2020 Form 10-K Financial Statement

#000137367021000016 Filed on March 08, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GRBK Green Brick Partners, Inc. Stock $grbk

2020 Form 10-K Financial Statement

#000137367021000016 Filed on March 08, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GRBK
Green Brick Partners, Inc. Stock $grbk