Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 105,662	$ 69,654
Restricted cash		32,864
Total cash, cash equivalents, and restricted cash shown in our consolidated statements of cash flows	$ 105,662	$ 102,518	$ 75,567	$ 106,006