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Notes Receivable (Schedule of Notes Receivables) (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 12 Months Ended
Nov. 23, 2013
Nov. 22, 2013
Dec. 31, 2013
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable     $ 7,556us-gaap_NotesReceivableNet $ 0us-gaap_NotesReceivableNet
Rivendell UM, LLC        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable     5,256us-gaap_NotesReceivableNet
/ us-gaap_CounterpartyNameAxis
= grbk_RivendellUMLLCMember		  
Interest rate 17.90%grbk_FinancingReceivableInterestRate
/ us-gaap_CounterpartyNameAxis
= grbk_RivendellUMLLCMember		 15.00%grbk_FinancingReceivableInterestRate
/ us-gaap_CounterpartyNameAxis
= grbk_RivendellUMLLCMember		 17.90%grbk_FinancingReceivableInterestRate
/ us-gaap_CounterpartyNameAxis
= grbk_RivendellUMLLCMember		  
Major Road Developers, LLC        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable     2,200us-gaap_NotesReceivableNet
/ us-gaap_CounterpartyNameAxis
= grbk_MajorRoadDevelopersLLCMember		  
Interest rate     0.00%grbk_FinancingReceivableInterestRate
/ us-gaap_CounterpartyNameAxis
= grbk_MajorRoadDevelopersLLCMember		  
Other Note Receivables        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable     $ 100us-gaap_NotesReceivableNet
/ us-gaap_CounterpartyNameAxis
= grbk_OtherNoteReceivablesMember		  
Interest rate     5.00%grbk_FinancingReceivableInterestRate
/ us-gaap_CounterpartyNameAxis
= grbk_OtherNoteReceivablesMember