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Investment in Direct Finance Leases (Details)
12 Months Ended
Dec. 31, 2014
Leases [Abstract]  
Direct finance lease, interest rate, minimum 10.00%grbk_CapitalLeasesNetInvestmentinDirectFinancingLeasesInterestRateMinimum
Direct finance lease, interest rate, maximum 12.00%grbk_CapitalLeasesNetInvestmentinDirectFinancingLeasesInterestRateMaximum