Annual report pursuant to Section 13 and 15(d)

Mortgage Note Receivable - Additional Information (Detail)

v2.4.1.9
Mortgage Note Receivable - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 12 Months Ended
Jul. 25, 2014
Dec. 31, 2014
sqft
Jul. 25, 2014
sqft
Debt Disclosure [Abstract]      
Second mortgage development loan   $ 5,600us-gaap_MortgageLoansOnRealEstate $ 5,600us-gaap_MortgageLoansOnRealEstate
Acquisition of our property, area   61,306us-gaap_AreaOfRealEstateProperty 81,371us-gaap_AreaOfRealEstateProperty
Construction loans scheduled maturity 2015-07    
Percentage of Interest earned in cash     9.00%good_PercentageOfMortgageLoanInterestEarnedInCash
Estimated percentage of rate of Interest     22.00%good_EffectOfMortgageLoanRateOfReturnEstimate
Mortgage development loan scheduled maturity 2016-07    
Mortgage development loan scheduled maturity extension period option 1 year    
Cash interest income and accrued exit fee revenue recognized   $ 466good_InterestIncomeFromMortgageNoteReceivable