Annual report pursuant to Section 13 and 15(d)

Mortgage Notes Payable and Line of Credit - Summary of Interest Rate Cap Agreement (Detail)

v2.4.1.9
Mortgage Notes Payable and Line of Credit - Summary of Interest Rate Cap Agreement (Detail) (Mortgage Notes Payable [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Mortgage Notes Payable [Member]
   
Debt Instrument [Line Items]    
Date of Issuance Nov. 26, 2013  
Notional Amount $ 8,200invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= good_MortgageNotesPayableMember
 
LIBOR Cap 3.00%us-gaap_DerivativeCapInterestRate
/ us-gaap_DerivativeByNatureAxis
= good_MortgageNotesPayableMember
 
Maturity Date Dec. 01, 2016  
Cost 31us-gaap_DerivativeCostOfHedge
/ us-gaap_DerivativeByNatureAxis
= good_MortgageNotesPayableMember
31us-gaap_DerivativeCostOfHedge
/ us-gaap_DerivativeByNatureAxis
= good_MortgageNotesPayableMember
Fair Value $ 4us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet
/ us-gaap_DerivativeByNatureAxis
= good_MortgageNotesPayableMember
$ 22us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet
/ us-gaap_DerivativeByNatureAxis
= good_MortgageNotesPayableMember