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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Net periodic benefit cost:      
Service cost $ 1,471 $ 1,193 $ 1,260
Interest cost 634 727 607
Expected return on plan assets (1,392) (1,548) (1,267)
Amortization of actuarial losses 795 247 309
Net periodic benefit cost 1,508 619 909
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Net actuarial (gain) loss 2,488 5,638 (654)
Amortization of actuarial losses (771) (196) (406)
Amount recognized in other comprehensive income (loss) 1,717 5,442 (1,060)
Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 3,225 $ 6,061 $ (151)