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Organization and Significant Accounting Policies - Cash And Cash Equivalents (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 204,301 $ 184,224 $ 141,590  
Restricted cash 15,665 14,801 2,929  
Total cash, cash equivalents and restricted cash $ 219,966 $ 199,025 $ 144,519 $ 188,622