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Property and Equipment (Summary of Property and Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 2,255us-gaap_PropertyPlantAndEquipmentGross $ 1,242us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated deprecation (626)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (377)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property and equipment, net 1,629us-gaap_PropertyPlantAndEquipmentNet 865us-gaap_PropertyPlantAndEquipmentNet
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 196us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
150us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Computers and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 465us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
339us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Model home furnishings    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,114us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= grbk_ModelHomeFurnishingsMember
647us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= grbk_ModelHomeFurnishingsMember
Field trailers    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 10us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= grbk_FieldTrailersMember
10us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= grbk_FieldTrailersMember
Design center    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 470us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= grbk_DesignCentersMember
$ 96us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= grbk_DesignCentersMember