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Real Estate and Intangible Assets - Components of Investments in Real Estate (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Real estate:    
Land $ 104,337 $ 104,719
Building and improvements 663,262 662,661
Tenant improvements 54,322 54,369
Accumulated depreciation (138,070) (131,661)
Total real estate, net $ 683,851 $ 690,088