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Employee Benefit Plans (Pension Benefit Plan) - Components of Net Periodic Pension Cost and Amounts Recognized Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net periodic benefit cost:      
Service cost $ 1,270 $ 1,471 $ 1,193
Interest cost 444 634 727
Expected return on plan assets (1,679) (1,392) (1,548)
Amortization of actuarial losses 970 795 247
Net periodic benefit cost 1,005 1,508 619
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net actuarial (gain) loss 1,784 2,488 5,638
Amortization of actuarial losses (1,212) (771) (196)
Amount recognized in other comprehensive income (loss) 572 1,717 5,442
Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 1,577 $ 3,225 $ 6,061