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Organization and Basis of Presentation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 subsidiary | Oct. 27, 2014 | Jun. 10, 2014
Class of Stock [Line Items] |  |  |
Shares issued in rights offering | 14,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |
Ownership percentage by parent included in consolidation (more than) | 50.00%grbk_OwnershipPercentagebyParentIncludedinConsolidation |  |
Number of subsidiaries created | 77 grbk_NumberofSubsidiaries |  |
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Noncash portion of business acquisition | 6,237,584 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Reverse Recapitalization |  |  |
Class of Stock [Line Items] |  |  |
Proceeds from rights offering |  | $ 70.0 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember |
Reverse Recapitalization | Common Stock | LLC and LP | JBGL |  |  |
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 |
Reverse Recapitalization | Term Loan Facility | Secured Debt | Greenlight Capital, Inc |  |  |
Class of Stock [Line Items] |  |  |
Debt instrument, face amount |  | 150.0 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 |
Reverse Recapitalization | Rights | Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Issue price of shares |  | $ 5.00 us-gaap_SharesIssuedPricePerShare / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_RightsMember |
Proceeds from rights offering |  | 24.2 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_RightsMember |
Shares of common stock authorized, conversion ratio |  | 2.2445 grbk_CommonStockSharesAuthorizedConversionRatio / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_RightsMember |
Shares issued in rights offering |  | 4,843,384 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_RightsMember |
Reverse Recapitalization | Private Placement | Common Stock | Third Point LLC and Affiliates |  |  |
Class of Stock [Line Items] |  |  |
Proceeds from rights offering |  | 21.0 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_CounterpartyNameAxis = grbk_ThirdPointLLCandAffiliatesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |
Shares issued in rights offering |  | 4,198,998 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_CounterpartyNameAxis = grbk_ThirdPointLLCandAffiliatesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |
Reverse Recapitalization | Private Placement | Greenlight Capital, Inc | Common Stock | Third Point LLC and Affiliates |  |  |
Class of Stock [Line Items] |  |  |
Proceeds from rights offering |  | $ 24.8 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_CounterpartyNameAxis = grbk_ThirdPointLLCandAffiliatesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |
Shares issued in rights offering |  | 4,957,618 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_CounterpartyNameAxis = grbk_ThirdPointLLCandAffiliatesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |

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