Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation of Interim Period Statements - Schedule of Reconciles of Cash, Cash Equivalents and Restricted Cash Balances (Detail)

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Basis of Presentation of Interim Period Statements - Schedule of Reconciles of Cash, Cash Equivalents and Restricted Cash Balances (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 28,545 $ 68,688 $ 14,272 $ 44,570
Restricted cash, included in restricted cash and investments 68,001 165,149 262,550 228,771
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 96,546 $ 233,837 $ 276,822 $ 273,341