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Summary of Investments in Real Estate (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Real Estate Properties [Line Items]    
Investments in real estate, Book Value $ 399,674 $ 854,646
Less: Accumulated depreciation and amortization (30,974) (138,214)
Investments in real estate, net, Book Value [1] 368,700 716,432
Multifamily real estate properties    
Real Estate Properties [Line Items]    
Investments in real estate, Book Value 17,118 147,201
Office    
Real Estate Properties [Line Items]    
Investments in real estate, Book Value 217,152 397,769
Industrial real estate properties    
Real Estate Properties [Line Items]    
Investments in real estate, Book Value 14,816 93,423
Retail real estate properties    
Real Estate Properties [Line Items]    
Investments in real estate, Book Value 115,182 164,019
Parcels of land    
Real Estate Properties [Line Items]    
Investments in real estate, Book Value $ 35,406 $ 52,234
[1] As of September 30, 2017, one of our office properties, with a carrying amount of $47,990, and two of our parcels of land, with a carrying amount of $14,839, 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.