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v2.4.1.9

Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of residential units |  |  |  |  |  |  |  |  | $ 200,650 us-gaap_HomeBuildingRevenue | $ 168,591 us-gaap_HomeBuildingRevenue | $ 50,105 us-gaap_HomeBuildingRevenue
Sale of land and lots |  |  |  |  |  |  |  |  | 45,452 us-gaap_LandSales | 33,735 us-gaap_LandSales | 22,927 us-gaap_LandSales
Revenues | 67,574 us-gaap_SalesOfRealEstate | 49,676 us-gaap_SalesOfRealEstate | 65,843 us-gaap_SalesOfRealEstate | 63,009 us-gaap_SalesOfRealEstate | 55,699 us-gaap_SalesOfRealEstate | 67,156 us-gaap_SalesOfRealEstate | 46,711 us-gaap_SalesOfRealEstate | 32,760 us-gaap_SalesOfRealEstate |  |  |
Gross profit | 15,300 us-gaap_GrossProfit | 15,024 us-gaap_GrossProfit | 16,483 us-gaap_GrossProfit | 15,848 us-gaap_GrossProfit | 15,860 us-gaap_GrossProfit | 20,847 us-gaap_GrossProfit | 12,368 us-gaap_GrossProfit | 9,122 us-gaap_GrossProfit |  |  |
Gross Profit on Land and Lots |  |  |  |  |  |  |  |  | 11,370 grbk_GrossProfitonLandandLots | 12,222 grbk_GrossProfitonLandandLots | 7,671 grbk_GrossProfitonLandandLots
Gross Profit, Home Building |  |  |  |  |  |  |  |  | 51,285 grbk_GrossProfitHomeBuilding | 45,975 grbk_GrossProfitHomeBuilding | 10,463 grbk_GrossProfitHomeBuilding
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 246,102 us-gaap_SalesOfRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 202,326 us-gaap_SalesOfRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 73,032 us-gaap_SalesOfRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Gross profit |  |  |  |  |  |  |  |  | 62,655 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 58,197 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 18,134 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Assets | 274,303 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  |  |  | 228,777 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  |  |  | 274,303 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 228,777 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |
Operating Segments | Texas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of residential units |  |  |  |  |  |  |  |  | 83,958 us-gaap_HomeBuildingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_TX | 52,764 us-gaap_HomeBuildingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_TX | 11,659 us-gaap_HomeBuildingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_TX
Gross Profit, Home Building |  |  |  |  |  |  |  |  | 20,109 grbk_GrossProfitHomeBuilding / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_TX | 15,055 grbk_GrossProfitHomeBuilding / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_TX | 2,325 grbk_GrossProfitHomeBuilding / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_TX
Assets | 44,771 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_TX |  |  |  | 25,494 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_TX |  |  |  | 44,771 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_TX | 25,494 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_TX |
Operating Segments | Georgia |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of residential units |  |  |  |  |  |  |  |  | 116,692 us-gaap_HomeBuildingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_GA | 115,827 us-gaap_HomeBuildingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_GA | 38,446 us-gaap_HomeBuildingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_GA
Gross Profit, Home Building |  |  |  |  |  |  |  |  | 31,176 grbk_GrossProfitHomeBuilding / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_GA | 30,920 grbk_GrossProfitHomeBuilding / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_GA | 8,138 grbk_GrossProfitHomeBuilding / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_GA
Assets | 129,361 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_GA |  |  |  | 99,239 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_GA |  |  |  | 129,361 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_GA | 99,239 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stpr_GA |
Operating Segments | Land Development |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of land and lots |  |  |  |  |  |  |  |  | 45,452 us-gaap_LandSales / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = grbk_LandDevelopmentMember | 33,735 us-gaap_LandSales / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = grbk_LandDevelopmentMember | 22,927 us-gaap_LandSales / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = grbk_LandDevelopmentMember
Gross Profit on Land and Lots |  |  |  |  |  |  |  |  | 11,370 grbk_GrossProfitonLandandLots / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = grbk_LandDevelopmentMember | 12,222 grbk_GrossProfitonLandandLots / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = grbk_LandDevelopmentMember | 7,671 grbk_GrossProfitonLandandLots / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = grbk_LandDevelopmentMember
Assets | $ 100,171 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = grbk_LandDevelopmentMember |  |  |  | $ 104,044 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = grbk_LandDevelopmentMember |  |  |  | $ 100,171 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = grbk_LandDevelopmentMember | $ 104,044 us-gaap_InventoryRealEstate / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = grbk_LandDevelopmentMember |

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the homebuilding revenue generation activity. + References No definition available. + Details
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Namespace Prefix: | grbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Gross Profit on Land and Lots + References No definition available. + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Revenue related to the sale of homes and home building activities including design, development, general contracting, and renovation services for residential buildings, including single-family houses, multifamily housing, townhouses, apartments, and modular housing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Total of (1) improvements, (2) held-for-sale, (3) land and land under development, (4) construction-in-process, (5) mortgage loans held-in-inventory, and (6) other real estate investments which are considered inventory due to being held for sale or disposition. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Revenue from the sale of land in the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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