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Debt (Schedule of Lines of Credit Outstanding) (Details) (Subsidiary of JBGL, Inwood National Bank, USD $)
Mar. 31, 2015
Dec. 31, 2014
Oct. 13, 2014
Oct. 13, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]          
Borrowings on lines of credit $ 19,500,000us-gaap_LineOfCredit $ 14,061,000us-gaap_LineOfCredit      
Direct Finance Leases A
         
Line of Credit Facility [Line Items]          
Borrowings on lines of credit 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesAMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
662,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesAMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
     
Line of credit, maximum borrowing capacity         4,800,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesAMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
Direct Finance Leases B
         
Line of Credit Facility [Line Items]          
Borrowings on lines of credit 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesBMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
899,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesBMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
     
Line of credit, maximum borrowing capacity         3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesBMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
John's Creek
         
Line of Credit Facility [Line Items]          
Borrowings on lines of credit 19,500,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_JohnsCreekMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
12,500,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= grbk_JohnsCreekMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
     
Line of credit, maximum borrowing capacity       $ 25,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= grbk_JohnsCreekMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
$ 8,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= grbk_JohnsCreekMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
Stated interest rate     4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= grbk_JohnsCreekMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
   
Minimum rate on Inwood loan | Direct Finance Leases A          
Line of Credit Facility [Line Items]          
Stated interest rate         4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesAMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
/ us-gaap_VariableRateAxis
= grbk_MinimumrateonInwoodloanMember
Minimum rate on Inwood loan | Direct Finance Leases B          
Line of Credit Facility [Line Items]          
Stated interest rate         4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= grbk_DirectFinanceLeasesBMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LineOfCreditFacilityAxis
= grbk_InwoodNationalBankMember
/ us-gaap_VariableRateAxis
= grbk_MinimumrateonInwoodloanMember