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Employee Benefit Plans - Net Defined Benefit Plan Costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Compensation And Retirement Disclosure [Abstract]    
Service costs $ 2,927 $ 1,973
Interest costs 1,357 1,072
Amortization of actuarial loss 651 317
Expected return on plan assets (1,181) (633)
Net defined benefit plan costs $ 3,754 $ 2,729