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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   $ 0.4us-gaap_DebtIssuanceCosts
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$ 0us-gaap_DebtIssuanceCosts
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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
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Voluntary prepayment premium 1.00%grbk_DebtInstrumentVoluntaryPrepaymentPremiumPercentage
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Reverse Recapitalization | Term Loan Facility | Other Assets | Secured Debt        
Debt Instrument [Line Items]        
Debt issuance cost   0.4us-gaap_DebtIssuanceCosts
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Reverse Recapitalization | Term Loan Facility | Greenlight Capital, Inc | Secured Debt        
Debt Instrument [Line Items]        
Percentage of voting interest 49.90%grbk_PercentageofVotingInterest
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Debt instrument, term 5 years      
Debt instrument, face amount 150.0us-gaap_DebtInstrumentFaceAmount
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Stated interest rate 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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Reverse Recapitalization | Minimum | Term Loan Facility | Secured Debt        
Debt Instrument [Line Items]        
Fixed charge coverage ratio, one (no more than) 0.80grbk_DebtInstrumentCovenantTermsFixedChargeCoverageRatio
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Fixed charge coverage ratio, two (no more than) 1.00grbk_DebtInstrumentCovenantTermsFixedChargeCoverageRatioTwo
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Reverse Recapitalization | Maximum | Term Loan Facility | Secured Debt        
Debt Instrument [Line Items]        
Fixed charge coverage ratio, one (no more than) 1.00grbk_DebtInstrumentCovenantTermsFixedChargeCoverageRatio
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Fixed charge coverage ratio, two (no more than) 1.20grbk_DebtInstrumentCovenantTermsFixedChargeCoverageRatioTwo
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Scenario, Forecast | Reverse Recapitalization | Term Loan Facility | Greenlight Capital, Inc | Secured Debt        
Debt Instrument [Line Items]        
Stated interest rate       10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
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