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Employee Benefit Plans - Schedule of net defined benefit plan costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Retirement Benefits [Abstract]    
Service costs $ 4,303 $ 3,760
Interest costs 2,018 1,736
Amortization of actuarial loss 62 167
Expected return on plan assets (1,362) (1,261)
Net defined benefit plan costs $ 5,021 $ 4,402