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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Accounting Policies [Abstract]        
Cash and cash equivalents $ 140,229 $ 200,996 $ 254,643  
Restricted cash 76 62,457 62,324  
Total cash, cash equivalents, and restricted cash shown in the condensed consolidated statement of cash flows $ 140,305 $ 263,453 $ 316,967 $ 97,542