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Employee Benefit Plans - Changes in Other Comprehensive Income (Detail) - Defined Benefit Pension Plans - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial gain (loss) arising during the year $ 1,330 $ (2,709) $ 498
Amortization of actuarial (gain) loss 1,584 1,937 1,704
Total $ 2,914 $ (772) $ 2,202