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Reverse Recapitalization - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Oct. 27, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 10, 2014
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 100,000,000 us-gaap_CommonStockSharesAuthorized |  | 100,000,000 us-gaap_CommonStockSharesAuthorized |  |  |
Common stock, par value (in dollars per share) | 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  |
Common stock, shares outstanding (in shares) | 31,346,084 us-gaap_CommonStockSharesOutstanding |  | 11,108,500 us-gaap_CommonStockSharesOutstanding |  |  |
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Noncash portion of business acquisition | 6,237,584 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Common stock, shares outstanding (in shares) | 31,346,084 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 11,108,500 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 11,108,500 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 11,108,500 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Reverse Recapitalization |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 100,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember |  |  |  |  |
Common stock, par value (in dollars per share) | 0.01 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 31,346,084 us-gaap_CommonStockSharesOutstanding / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember |  |  |  |
Business Acquisition, Transaction Costs |  | $ 3.2 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember |  |  |  |
Reverse Recapitalization | JBGL | LLC and LP | Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Agreed upon purchase price, cash and equity |  | 275 grbk_PurchasePriceCashandStock / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_PartnershipMember / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_CounterpartyNameAxis = grbk_BuilderFinanceandCapitalMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 275 grbk_PurchasePriceCashandStock / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_PartnershipMember / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_CounterpartyNameAxis = grbk_BuilderFinanceandCapitalMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Cash payment to acquired business |  | $ 191.8 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_PartnershipMember / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_CounterpartyNameAxis = grbk_BuilderFinanceandCapitalMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Noncash portion of business acquisition |  | 11,108,500 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_PartnershipMember / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_CounterpartyNameAxis = grbk_BuilderFinanceandCapitalMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issue price of shares |  | $ 7.49 us-gaap_SharesIssuedPricePerShare / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_PartnershipMember / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_CounterpartyNameAxis = grbk_BuilderFinanceandCapitalMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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