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v3.20.2

Organization, Basis of Presentation and Significant Accounting Policies - Additional Information (Details) | Jul. 27, 2020
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Subsequent Event |
Subsequent Event [Line Items] |
Rent obligations deferred (as percent) | 2.00%

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- Definition Rent Obligations Deferred, Percentage + References No definition available. + Details
Name: | good_RentObligationsDeferredPercentage
Namespace Prefix: | good_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |