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v2.4.1.9

Related Party Transactions (Details) (USD $) | 12 Months Ended | 10 Months Ended | 11 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 27, 2014 | Nov. 30, 2014 | Oct. 27, 2014 | Oct. 28, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Management fees expense – related party | $ 1,266,000 grbk_ManagementFeeExpenseRelatedParty | $ 1,016,000 grbk_ManagementFeeExpenseRelatedParty | $ 581,000 grbk_ManagementFeeExpenseRelatedParty |  |  |  |
Interest incurred | 4,146,000 us-gaap_RealEstateInventoryCapitalizedInterestCostsIncurred | 1,380,000 us-gaap_RealEstateInventoryCapitalizedInterestCostsIncurred | 405,000 us-gaap_RealEstateInventoryCapitalizedInterestCostsIncurred |  |  |  |
Executive |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Management fee percentage |  |  |  | 0.375%grbk_ManagementFeePercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_OfficerMember |  |  |
Management fees expense – related party |  | 1,016,000 grbk_ManagementFeeExpenseRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_OfficerMember | 581,000 grbk_ManagementFeeExpenseRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_OfficerMember | 1,300,000 grbk_ManagementFeeExpenseRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_OfficerMember |  |  |
Selling, General and Administrative Expenses |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Rent expense | 500,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 200,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 100,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |  |  |  |
Interest and Fees Income | Affiliates of Company |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest income | 0 us-gaap_InterestAndFeeIncomeLoansCommercialRealEstate / us-gaap_IncomeStatementLocationAxis = grbk_InterestandFeesIncomeMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_OtherAffiliatesMember | 700,000 us-gaap_InterestAndFeeIncomeLoansCommercialRealEstate / us-gaap_IncomeStatementLocationAxis = grbk_InterestandFeesIncomeMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_OtherAffiliatesMember | 900,000 us-gaap_InterestAndFeeIncomeLoansCommercialRealEstate / us-gaap_IncomeStatementLocationAxis = grbk_InterestandFeesIncomeMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_OtherAffiliatesMember |  |  |  |
Texas Headquarters | Selling, General and Administrative Expenses | Family Members of CEO |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Rent expense |  | 28,137 us-gaap_OperatingLeasesRentExpenseNet / dei_EntityByLocationAxis = stpr_TX / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefExecutiveOfficerMember | 18,000 us-gaap_OperatingLeasesRentExpenseNet / dei_EntityByLocationAxis = stpr_TX / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefExecutiveOfficerMember |  | 13,913 us-gaap_OperatingLeasesRentExpenseNet / dei_EntityByLocationAxis = stpr_TX / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefExecutiveOfficerMember |  |
Reverse Recapitalization | Term Loan Facility | Secured Debt | Greenlight Capital, Inc |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Percentage of voting interest |  |  |  | 49.90%grbk_PercentageofVotingInterest / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |  | 49.90%grbk_PercentageofVotingInterest / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
Debt instrument, term |  |  |  |  |  | 5 years |
Debt instrument, face amount |  |  |  | 150,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |  | 150,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
Stated interest rate |  |  |  | 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |  | 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |
Accrued interest payable | 152,400,000 grbk_SecuredDebtIncludingInterestPayable / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |  |  |  |  |  |
Interest incurred | $ 2,400,000 us-gaap_RealEstateInventoryCapitalizedInterestCostsIncurred / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |  |  |  |  |  |
Reverse Recapitalization | Scenario, Forecast | Term Loan Facility | Secured Debt | Greenlight Capital, Inc |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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