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Summary of Operations and Significant Accounting Policies - Schedule of Reconciles of Cash, Cash Equivalents and Restricted Cash Balances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]      
Cash and cash equivalents $ 35,371 $ 59,835 $ 50,768
Restricted cash, included in restricted cash and investments 105,331 60,370 290,562
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 140,702 $ 120,205 $ 341,330