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Basis of Presentation and Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations [Abstract]        
Cash and cash equivalents $ 452,352 $ 189,680 $ 385,474 $ 134,758
Restricted cash 5,770 4,787 4,787 4,826
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 458,122 $ 194,467 $ 390,261 $ 139,584