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Subsequent Events - Additional Information (Detail) (USD $)
6 Months Ended 0 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Aug. 05, 2014
Subsequent Events [Member]
Aug. 06, 2014
Subsequent Events [Member]
Fenway-Wateridge [Member]
Aug. 06, 2014
Subsequent Events [Member]
Stamford [Member]
Aug. 06, 2014
Subsequent Events [Member]
Stamford [Member]
Office
Aug. 06, 2014
Subsequent Events [Member]
The Shops at Wailea [Member]
Jul. 07, 2014
Playa Vista / Water's Edge [Member]
Subsequent Events [Member]
Jul. 07, 2014
Playa Vista / Water's Edge [Member]
Subsequent Events [Member]
Subsequent Event [Line Items]                  
Outstanding loans acquired for aggregate price               $ 14,000,000  
Remaining participation interest                 50.00%
Percentage of outstanding Common Shares voted in favor of the adoption of the Trust's Plan of Liquidation     73.00%            
Proceeds from sale of interest in joint venture       2,383,000          
Number of office properties           7      
Net proceeds from distributions of venture 7,755,000 10,731,000     9,400,000        
Net proceeds from loan repayment on B-Note             $ 7,556,000