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Significant Accounting Policies Significant Accounting Policies (Schedule of Real Estate Inventory) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Inventory Disclosure [Abstract] |  |
Completed home inventory and residential lots held for sale | $ 47,048 grbk_InventoryFinishedHomesandLandHeldforSale | $ 33,950 grbk_InventoryFinishedHomesandLandHeldforSale
Work in process | 203,756 grbk_InventoryHomesunderConstructionandLandunderDevelopment | 140,325 grbk_InventoryHomesunderConstructionandLandunderDevelopment
Undeveloped land | 16,220 us-gaap_InventoryOperativeBuildersOther | 54,502 us-gaap_InventoryOperativeBuildersOther
Land not owned under option agreements | 7,279 us-gaap_LandUnderPurchaseOptionsRecorded | 0 us-gaap_LandUnderPurchaseOptionsRecorded
Inventory, Real Estate | $ 274,303 us-gaap_InventoryOperativeBuilders | $ 228,777 us-gaap_InventoryOperativeBuilders

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- Definition Inventory, Finished Homes and Land Held for Sale + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of capitalized construction costs of homes for future sale and costs of land expected to be developed in the near term. + References No definition available. + Details
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- Details
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- Definition The net carrying amount as of the balance sheet date of the sum of the various components of an operative builder's inventory, including finished homes. Operative builders primarily consist of entities that develop land, construct residential homes and commercial and industrial buildings thereon, and sell them to home buyers and operators of the commercial and industrial properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount as of the balance sheet date of all of a real estate developer's inventories that are either not otherwise specified in the taxonomy or are not separately reported by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount as of the balance sheet date of land not owned but under a contract in which the entity has an option to purchase the land. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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