Quarterly report pursuant to Section 13 or 15(d)

Real Estate Held for Sale - Components of Assets and Liabilities Held for Sale (Detail)

v2.4.1.9
Real Estate Held for Sale - Components of Assets and Liabilities Held for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
ASSETS HELD FOR SALE  
TOTAL ASSETS HELD FOR SALE $ 2,980us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
LIABILITIES HELD FOR SALE  
TOTAL LIABILITIES HELD FOR SALE 2,587us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Real Estate Held for Sale [Member]  
ASSETS HELD FOR SALE  
Real estate, at cost 2,795good_DisposalGroupIncludingDiscontinuedOperationRealEstateInvestmentPropertyAtCost
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember
Less: accumulated depreciation (615)good_DisposalGroupIncludingDiscontinuedOperationRealEstateInvestmentPropertyAccumulatedDepreciation
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember
Total real estate held for sale, net 2,180good_DisposalGroupIncludingDiscontinuedOperationRealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember
Lease intangibles, net 17us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember
Funds held in escrow 739good_DisposalGroupIncludingDiscontinuedOperationEscrowDeposit
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember
Deferred rent receivable, net 32good_DisposalGroupIncludingDiscontinuedOperationDeferredRentReceivablesNet
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember
Deferred financing costs, net 9good_DisposalGroupIncludingDiscontinuedOperationDeferredFinancingCostsNet
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember
Other assets 3us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember
TOTAL ASSETS HELD FOR SALE 2,980us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember
LIABILITIES HELD FOR SALE  
Mortgage notes payable 2,503good_DisposalGroupIncludingDiscontinuedOperationMortgageNotesPayable
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember
Other liabilities 84us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember
TOTAL LIABILITIES HELD FOR SALE $ 2,587us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_RealEstatePropertiesAxis
= good_RealEstateHeldForSaleMember