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Equity Investments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 10, 2016
Apr. 27, 2016
Apr. 13, 2016
Sep. 30, 2016
Jun. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]                    
Refinancing amount         $ 14,304,000 $ 14,304,000   $ 5,280,000 $ 8,395,000 $ 24,005,000
Sullivan Center, Chicago [Member] | Chicago, IL [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Percentage of funded loan for retail tenant improvements and capital expenditure           100.00%        
Percentage of funded loan needed for office tenant improvements and capital expenditure           80.00%        
Fund received for tenant improvements             $ 2,794,000      
Accrued interest rate on loan funded           15.00%        
WRT One South State Lender LP and WRT Elad One South State Equity LP [Member]]                    
Schedule of Equity Method Investments [Line Items]                    
Gross proceeds from sale of equity investments   $ 95,270,000                
701 Seventh WRT Investor LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Additional capital contributions         2,079,000          
Capital contributions         122,765,000          
701 Seventh WRT Investor LLC [Member] | Scenario, Forecast [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Additional capital contributions       $ 2,201,000            
Capital contributions       $ 125,000,000            
Mentor Retail LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Nominal % Ownership 49.90%                  
Proceeds from sale of real estate, gross $ 10,450,000                  
Buyer's deposit under the purchase contract 400,000                  
Expected distributions from venture 3,973,000                  
Liquidation value of property $ 1,055,000                  
446 High Line LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Capital contributions     $ 2,540,000              
Refinancing amount     3,175,000              
Short term loan     $ 635,000   $ 635,000 $ 635,000        
Interest rate     12.00%