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Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations [Abstract]        
Cash and cash equivalents $ 326,028 $ 189,680 $ 134,758  
Restricted cash 5,770 4,787 4,826  
Total cash, cash equivalents and restricted cash shown in the statements of cash flows $ 331,798 $ 194,467 $ 139,584 $ 71,893