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Investments - Summary of Assets and Liabilities Related to Company's Consolidated Variable Interest Entity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Variable Interest Entity [Line Items]        
Cash and cash equivalents $ 291,880 $ 267,738 $ 331,542 $ 314,416
Construction in progress included in real estate investments 2,965 2,906    
Other liabilities 10,716 18,472    
Variable Interest Entity [Member]        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 65 57    
Construction in progress included in real estate investments 2,965 2,906    
Accrued expenses 56 $ 21    
Other liabilities $ 26