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Share-Based Compensation (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Oct. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum amount to be paid to individual pursuant to cash bonus award | $ 2,000,000 grbk_SharebasedCompensationArrangementbySharebasedPaymentAwardMaximumAmounttobePaidtoIndividual |  |
Shares granted | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |
Per share exercise price | $ 7.49 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
Unamortized share-based compensation expense | 1,400,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |
Unamortized share-based compensation expense, weighted average period of recognition | 4 years 9 months 25 days |  |
Forfeiture rate | 0.00%grbk_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsForfeitureRate |  |
Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Service period | 5 years |  |
Stock options issued | $ 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | $ 0 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |
2014 Equity Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of awards granted after expiration date | 0 grbk_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsGrantsafterExpirationDate / us-gaap_AwardTypeAxis = grbk_A2014EquityPlanMember |  |
Number of shares authorized and reserved for issuance |  |  | 2,350,956 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = grbk_A2014EquityPlanMember
Number of awards issued | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_AwardTypeAxis = grbk_A2014EquityPlanMember |  |
Executive Officers | 2014 Equity Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number eligible for awards | 4 grbk_SharebasedCompensationArrangementbySharebasedPaymentAwardNumbereligibleforawards / us-gaap_AwardTypeAxis = grbk_A2014EquityPlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember |  |
Non-employee Directors | 2014 Equity Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number eligible for awards | 6 grbk_SharebasedCompensationArrangementbySharebasedPaymentAwardNumbereligibleforawards / us-gaap_AwardTypeAxis = grbk_A2014EquityPlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |
Other Employees | 2014 Equity Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number eligible for awards | 150 grbk_SharebasedCompensationArrangementbySharebasedPaymentAwardNumbereligibleforawards / us-gaap_AwardTypeAxis = grbk_A2014EquityPlanMember / us-gaap_TitleOfIndividualAxis = grbk_OtherEmployeesMember |  |
Common Stock | Chief Executive Officer | Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted |  |  | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Per share exercise price |  |  | $ 7.49 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Number of trading days after grant date for which the exercise price was based |  |  | 5 days
Vesting period |  |  | 5 years

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number Anticipated to be Eligible for Awards + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeiture Rate + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Trading Days + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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