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Summary of Investments in Real Estate (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate Properties [Line Items]      
Investments in real estate, Book Value $ 854,646 $ 1,145,630 $ 1,151,339
Less: Accumulated depreciation and amortization (138,214) (158,688) $ (168,480)
Investments in real estate, net, Book Value [1] 716,432 986,942  
Multi-family real estate properties      
Real Estate Properties [Line Items]      
Investments in real estate, Book Value 147,201 470,689  
Office real estate properties      
Real Estate Properties [Line Items]      
Investments in real estate, Book Value 397,769 395,224  
Industrial real estate properties      
Real Estate Properties [Line Items]      
Investments in real estate, Book Value 93,423 94,938  
Retail real estate properties      
Real Estate Properties [Line Items]      
Investments in real estate, Book Value 164,019 134,331  
Parcels of land      
Real Estate Properties [Line Items]      
Investments in real estate, Book Value $ 52,234 $ 50,448  
[1] As of December 31, 2016, three of our multifamily properties, with a carrying amount of $62,428, and two of our parcels of land, with a carrying amount of $14,233, were considered held-for-sale.