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Property Dispositions - Additional Information (Detail) - USD ($)
Jun. 26, 2015
Jun. 15, 2015
Apr. 14, 2015
Jul. 16, 2015
Jun. 30, 2015
Dec. 31, 2014
Phoenix Az [Member] | 44 Monroe [Member]            
Property Dispositions (Line Items)            
Ownership percentage in real estate investment     83.70%      
Proceeds from sale of real estate, gross     $ 50,650,000      
Proceeds from sale of real estate, net     $ 49,143,000      
Liquidation value of property           $ 50,650,000
California [Member] | Cerritos [Member]            
Property Dispositions (Line Items)            
Proceeds from sale of real estate, gross   $ 30,500,000        
Liquidation value of property         $ 30,500,000 29,916,000
California [Member] | Cerritos [Member] | Subsequent Event [Member]            
Property Dispositions (Line Items)            
Buyer's deposit under the purchase contract       $ 850,000    
Stamford, CT [Member] | Highgrove [Member]            
Property Dispositions (Line Items)            
Ownership percentage in real estate investment 83.70%          
Proceeds from sale of real estate, gross $ 90,000,000          
Liquidation value of property         90,000,000 $ 84,867,000
Buyer's deposit under the purchase contract         $ 2,000,000