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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Payroll, benefits and related taxes, excluding severance benefits $ 9,743 $ 8,493
Withholding tax attributable to intercompany interest income 25,206 23,371
Interest on senior notes 3,444 8,205
Outside service fees 685 1,996
Others 2,552 2,734
Accrued expenses $ 41,630 $ 44,799