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Inventory (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Completed home inventory and residential lots held for sale $ 55,585grbk_InventoryFinishedHomesandLandHeldforSale $ 47,048grbk_InventoryFinishedHomesandLandHeldforSale
Work in process 210,647grbk_InventoryHomesunderConstructionandLandunderDevelopment 203,756grbk_InventoryHomesunderConstructionandLandunderDevelopment
Undeveloped land 16,220us-gaap_InventoryOperativeBuildersOther 16,220us-gaap_InventoryOperativeBuildersOther
Land not owned under option agreements 6,807us-gaap_LandUnderPurchaseOptionsRecorded 7,279us-gaap_LandUnderPurchaseOptionsRecorded
Inventory $ 289,259us-gaap_InventoryOperativeBuilders $ 274,303us-gaap_InventoryOperativeBuilders