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v2.4.1.9

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Deferred tax assets: |  |  |
Accrued bonuses | $ 315 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses | $ 0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses |
Accrued severance pay | 11 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments | 0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments |
Stock-based compensation | 14 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |
Federal net operating loss carryover | 62,575 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |
State net operating loss carryover | 1,161 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |
Basis in partnerships | 26,123 grbk_DeferredTaxAssetsBasisinPartnership | 0 grbk_DeferredTaxAssetsBasisinPartnership |
Warranty accrual | 161 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves | 0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves |
Historical BioFuel capitalized start-up costs | 24 grbk_DeferredTaxAssetsCapitalizedStartupCosts | 0 grbk_DeferredTaxAssetsCapitalizedStartupCosts |
Historical BioFuel - other | 16 us-gaap_DeferredTaxAssetsOther | 0 us-gaap_DeferredTaxAssetsOther |
Deferred tax assets, gross | 90,400 us-gaap_DeferredTaxAssetsGross | 0 us-gaap_DeferredTaxAssetsGross |
Valuation allowance | (1,161)us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net | 89,239 us-gaap_DeferredTaxAssetsNet | 0 us-gaap_DeferredTaxAssetsNet |
Deferred tax liabilities: |  |  |
Prepaid insurance | (11)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | 0 us-gaap_DeferredTaxLiabilitiesPrepaidExpenses |
Noncontrolling interests impact of M-1s | (31)grbk_DeferredTaxLiabilitiesImpactofNoncontrollingInterests | 0 grbk_DeferredTaxLiabilitiesImpactofNoncontrollingInterests |
Deferred tax liabilities, net | $ (42)us-gaap_DeferredTaxLiabilities | $ 0 us-gaap_DeferredTaxLiabilities |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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