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Summary of Investments in Real Estate (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Real Estate Properties [Line Items]    
Investments in real estate, Book Value $ 694,230 $ 854,646
Less: Accumulated depreciation and amortization (114,179) (138,214)
Investments in real estate, net, Book Value [1] 580,051 716,432
Multi-family real estate properties    
Real Estate Properties [Line Items]    
Investments in real estate, Book Value 63,158 147,201
Office real estate properties    
Real Estate Properties [Line Items]    
Investments in real estate, Book Value 365,206 397,769
Industrial real estate properties    
Real Estate Properties [Line Items]    
Investments in real estate, Book Value 48,377 93,423
Retail real estate properties    
Real Estate Properties [Line Items]    
Investments in real estate, Book Value 165,327 164,019
Parcels of land    
Real Estate Properties [Line Items]    
Investments in real estate, Book Value $ 52,162 $ 52,234
[1] As of March 31, 2017, one of our office properties, with a carrying amount of $4,627, and two of our parcels of land, with a carrying amount of $14,586, were considered held-for-sale. 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.