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Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 segment | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 27, 2014
Accounting Policies [Line Items] |  |  |  |
Allowance for doubtful accounts | $ 0 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 0 us-gaap_AllowanceForDoubtfulAccountsReceivable |  |
Growth period | 3 years |  |  |
Asset impairment charges | 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges |  |
Land not owned under option agreements | 7,279,000 us-gaap_LandUnderPurchaseOptionsRecorded | 0 us-gaap_LandUnderPurchaseOptionsRecorded |  |
Tax deductible goodwill | 70,900,000 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets |  |  |
One-time income tax benefit | (25,244,000)grbk_EffectiveIncomeTaxRateReconciliationChangeinTaxStatusAmount | 0 grbk_EffectiveIncomeTaxRateReconciliationChangeinTaxStatusAmount | 0 grbk_EffectiveIncomeTaxRateReconciliationChangeinTaxStatusAmount |
Deferred tax assets | 89,239,000 us-gaap_DeferredTaxAssetsNet | 0 us-gaap_DeferredTaxAssetsNet |  |
Valuation allowance for deferred tax assets | (1,161,000)us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance |
Deferred tax asset related to net operating loss carryforwards | 62,575,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |  |
Deferred tax asset related to basis in partnership | 26,123,000 grbk_DeferredTaxAssetsBasisinPartnership | 0 grbk_DeferredTaxAssetsBasisinPartnership |  |
Percentage of controlling interests in several builders by parent | 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent |  |  |
Percentage of noncontrolling interests in several builders by parent | 50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners |  |  |
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments |  |  |
Number of operating segments | 2 us-gaap_NumberOfOperatingSegments |  |  |
Minimum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Community life cycle | 2 years |  |  |
Home construction period | 3 months |  |  |
Management assumption, cost increases on future phases | 5.00%grbk_ImpairmentofRealEstateAssumptionsUsedCostofIncreasesinFuturePhasesPercent / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Useful lives of assets | 3 years |  |  |
Estimated warranty accrual per home closed | 250 grbk_StandardProductWarrantyAccrualEstimatedAccrualAmountPerHomeClosed / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Maximum |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Community life cycle | 6 years |  |  |
Home construction period | 8 months |  |  |
Management assumption, cost increases on future phases | 10.00%grbk_ImpairmentofRealEstateAssumptionsUsedCostofIncreasesinFuturePhasesPercent / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Useful lives of assets | 10 years |  |  |
Estimated warranty accrual per home closed | 800 grbk_StandardProductWarrantyAccrualEstimatedAccrualAmountPerHomeClosed / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Selling, General and Administrative Expenses |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Advertising Expense | 400,000 us-gaap_AdvertisingExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 500,000 us-gaap_AdvertisingExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 500,000 us-gaap_AdvertisingExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |
Other Assets |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Debt issuance cost | 400,000 us-gaap_DebtIssuanceCosts / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember | 0 us-gaap_DebtIssuanceCosts / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember |  |
Accrued Expenses |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Debt issuance cost |  | 200,000 us-gaap_DebtIssuanceCosts / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember |  |
Federal |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Net operating loss carryforward | 178,800,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |
Operating loss carryforward, expiration date | Dec. 31, 2029 |  |  |
State |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Net operating loss carryforward | 21,600,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |
Reverse Recapitalization |  |  |  |
Accounting Policies [Line Items] |  |  |  |
One-time income tax benefit |  |  |  | (26,564,000)grbk_EffectiveIncomeTaxRateReconciliationChangeinTaxStatusAmount / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember
Deferred tax assets |  |  |  | 63,900,000 us-gaap_DeferredTaxAssetsNet / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember
Reverse Recapitalization | Federal |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Net operating loss carryforward |  |  |  | 182,300,000 us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Reverse Recapitalization | State |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Net operating loss carryforward |  |  |  | $ 21,600,000 us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = grbk_ReverseRecapitalizationMember / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember

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