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Reverse Recapitalization - Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended
Oct. 27, 2014
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 10, 2014
Class of Stock [Line Items]            
Common stock, shares authorized (in shares)   100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized      
Common stock, par value (in dollars per share)   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare      
Common stock, shares outstanding (in shares)   31,346,084us-gaap_CommonStockSharesOutstanding 31,346,084us-gaap_CommonStockSharesOutstanding      
Common Stock            
Class of Stock [Line Items]            
Common stock, shares outstanding (in shares)   31,346,084us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
31,346,084us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
11,108,500us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
11,108,500us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Reverse Recapitalization            
Class of Stock [Line Items]            
Common stock, shares authorized (in shares)   100,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_BusinessAcquisitionAxis
= grbk_ReverseRecapitalizationMember
       
Common stock, par value (in dollars per share)   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_BusinessAcquisitionAxis
= grbk_ReverseRecapitalizationMember
       
Common stock, shares outstanding (in shares) 31,346,084us-gaap_CommonStockSharesOutstanding
/ us-gaap_BusinessAcquisitionAxis
= grbk_ReverseRecapitalizationMember
         
Business Acquisition, Transaction Costs     $ 3.2us-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 275grbk_PurchasePriceCashandStock
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_BusinessAcquisitionAxis
= grbk_ReverseRecapitalizationMember
/ us-gaap_CounterpartyNameAxis
= grbk_BuilderFinanceandCapitalMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
        275grbk_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 $ 191.8us-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 11,108,500us-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 $ 7.49us-gaap_SharesIssuedPricePerShare
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_PartnershipMember
/ us-gaap_BusinessAcquisitionAxis
= grbk_ReverseRecapitalizationMember
/ us-gaap_CounterpartyNameAxis
= grbk_BuilderFinanceandCapitalMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember