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v2.4.1.9

Debt (Schedule of Long-term Debt - Notes Payable) (Details) (USD $) | 12 Months Ended | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 31, 2014 | Dec. 13, 2013 | Dec. 17, 2013 | Apr. 16, 2014 | Apr. 15, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | $ 12,151,000 us-gaap_NotesPayable | $ 26,595,000 us-gaap_NotesPayable |  |  |  |  |  |
Repayments of Notes Payable | 22,434,000 us-gaap_RepaymentsOfNotesPayable | 16,309,000 us-gaap_RepaymentsOfNotesPayable | 5,152,000 us-gaap_RepaymentsOfNotesPayable |  |  |  |  |
Notes Payable | Briar Ridge Investments, LTD |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | 9,000,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_BriarRidgeInvestmentsLTDMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 9,000,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_BriarRidgeInvestmentsLTDMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |  |  |
Notes Payable | Plains Capital Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | 0 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_PlainsCapitalBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 7,500,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_PlainsCapitalBankMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |  |  |
Notes Payable | Bossy Boots Holding, LTD |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | 0 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_BossyBootsHoldingLTDMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 5,655,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_BossyBootsHoldingLTDMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |  |  |
Notes Payable | Lakeside DFW Land, LTD |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | 1,824,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_LakesideDFWLandLTDMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 2,980,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_LakesideDFWLandLTDMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |  |  |
Notes Payable | Other Unrelated Third Party |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | 0 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_OtherUnrelatedThirdPartyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 39,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_OtherUnrelatedThirdPartyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |  |  |
Notes Payable | Subordinated Lot Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes payable | 1,327,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_SubordinatedLotNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 1,421,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = grbk_SubordinatedLotNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |  |  |
Subsidiary of JBGL | Notes Payable | Briar Ridge Investments, LTD |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = grbk_BriarRidgeInvestmentsLTDMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |
Interest Payable | 0 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = grbk_BriarRidgeInvestmentsLTDMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | 9,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = grbk_BriarRidgeInvestmentsLTDMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |
Subsidiary of JBGL | Notes Payable | Plains Capital Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = grbk_PlainsCapitalBankMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |
Debt instrument, face amount |  |  |  |  |  | 7,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = grbk_PlainsCapitalBankMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |
Subsidiary of JBGL | Notes Payable | Bossy Boots Holding, LTD |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = grbk_BossyBootsHoldingLTDMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |  |
Debt instrument, face amount |  |  | 17,100,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = grbk_BossyBootsHoldingLTDMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |  |
Subsidiary of JBGL | Notes Payable | Lakeside DFW Land, LTD |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = grbk_LakesideDFWLandLTDMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = grbk_LakesideDFWLandLTDMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Debt instrument, face amount |  |  |  |  |  |  | 3,300,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = grbk_LakesideDFWLandLTDMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 3,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = grbk_LakesideDFWLandLTDMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Repayments of Notes Payable |  |  |  | $ 1,500,000 us-gaap_RepaymentsOfNotesPayable / us-gaap_DebtInstrumentAxis = grbk_LakesideDFWLandLTDMember / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  |
Subsidiaries of the Company | Minimum | Notes Payable | Subordinated Lot Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate | 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = grbk_SubordinatedLotNotesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |
Subsidiaries of the Company | Maximum | Notes Payable | Subordinated Lot Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate | 14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = grbk_SubordinatedLotNotesMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |

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