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Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 27, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 28, 2015
Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum period electable to pay interest in kind | 12 months |  |  |
Other Assets |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance cost |  | $ 0.4 us-gaap_DebtIssuanceCosts / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember | $ 0 us-gaap_DebtIssuanceCosts / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember |
Reverse Recapitalization | Term Loan Facility | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Mandatory prepayment, percentage of net cash proceeds from incurrence of debt | 100.00%grbk_DebtInstrumentMandatoryPrepaymentTermsPercentageofNetCashProceedsfromIncurrenceofIndebtedness / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  |
Voluntary prepayment premium | 1.00%grbk_DebtInstrumentVoluntaryPrepaymentPremiumPercentage / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  |
Reverse Recapitalization | Term Loan Facility | Other Assets | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance cost |  | 0.4 us-gaap_DebtIssuanceCosts / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |
Reverse Recapitalization | Term Loan Facility | Greenlight Capital, Inc | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of voting interest | 49.90%grbk_PercentageofVotingInterest / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |  |  |
Debt instrument, term | 5 years |  |  |
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 |  |  |
Stated interest rate | 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember |  |  |
Reverse Recapitalization | Minimum | Term Loan Facility | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed charge coverage ratio, one (no more than) | 0.80 grbk_DebtInstrumentCovenantTermsFixedChargeCoverageRatio / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Fixed charge coverage ratio, two (no more than) | 1.00 grbk_DebtInstrumentCovenantTermsFixedChargeCoverageRatioTwo / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Reverse Recapitalization | Maximum | Term Loan Facility | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed charge coverage ratio, one (no more than) | 1.00 grbk_DebtInstrumentCovenantTermsFixedChargeCoverageRatio / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Fixed charge coverage ratio, two (no more than) | 1.20 grbk_DebtInstrumentCovenantTermsFixedChargeCoverageRatioTwo / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Scenario, Forecast | Reverse Recapitalization | Term Loan Facility | Greenlight Capital, Inc | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  |  |  | 10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_DebtInstrumentAxis = grbk_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_MajorityShareholderMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition Mandatory percentage of the net cash proceeds received from the incurrence of certain debt or the issuance of certain equity securities that should be used to prepay the term loan facility. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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