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Restricted Cash - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Restricted Cash And Cash Equivalents [Abstract]    
Cash and cash equivalents $ 166,637 $ 141,714
Restricted cash included in other current assets 463  
Restricted cash 4,706 5,477
Total cash, cash equivalents and restricted cash $ 171,806 $ 147,191