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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
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 12,860 $ 68,688 $ 61,193 $ 44,570
Restricted cash, included in restricted cash and investments 9,358 165,149 127,085 228,771
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 22,218 $ 233,837 $ 188,278 $ 273,341