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Earnest Money Deposits (Schedule of Expected Land Purchase Payments Under Option Agreements) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Other Restricted Assets [Abstract] |  |
2015 | $ 37,383 grbk_LandunderPurchaseOptionsExpectedPurchasePaymentsNextTwelveMonths |
2016 | 23,269 grbk_LandunderPurchaseOptionsExpectedPurchasePaymentsYearTwo |
2017 | 10,918 grbk_LandunderPurchaseOptionsExpectedPurchasePaymentsYearThree |
Total | $ 71,570 grbk_LandunderPurchaseOptionsExercisePrice | $ 61,800 grbk_LandunderPurchaseOptionsExercisePrice

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- Definition Land under Purchase Options, Exercise Price + References No definition available. + Details
Name: | grbk_LandunderPurchaseOptionsExercisePrice
Namespace Prefix: | grbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Land under Purchase Options, Expected Purchase Payments, Next Twelve Months + References No definition available. + Details
Name: | grbk_LandunderPurchaseOptionsExpectedPurchasePaymentsNextTwelveMonths
Namespace Prefix: | grbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Land under Purchase Options, Expected Purchase Payments, Year Three + References No definition available. + Details
Name: | grbk_LandunderPurchaseOptionsExpectedPurchasePaymentsYearThree
Namespace Prefix: | grbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Land under Purchase Options, Expected Purchase Payments, Year Two + References No definition available. + Details
Name: | grbk_LandunderPurchaseOptionsExpectedPurchasePaymentsYearTwo
Namespace Prefix: | grbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_OtherRestrictedAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration