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