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Employee Benefit Plans (Net Periodic Cost) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]        
Service costs $ 43 $ 44 $ 129 $ 134
Interest costs 1,239 1,781 3,717 5,343
Amortization of net actuarial loss 1,690 1,321 5,070 3,961
Amortization of prior service credit (326) (777) (978) (2,331)
Net periodic costs $ 2,646 $ 2,369 $ 7,938 $ 7,107