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Consolidated Statements of Cash Flows (Parenthetical) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2014 USD ($)
Statement of Cash Flows [Abstract] |
Allowance for tenant improvement capitalized | $ 520

X
- Definition Allowance for tenant improvements capitalized. + References No definition available. + Details
Name: | good_AllowanceForTenantImprovementsCapitalized
Namespace Prefix: | good_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration