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Employee Benefit Plans (Pension Benefit Plan) - Components of Net Periodic Pension Cost and Amounts Recognized Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net periodic benefit cost:      
Service cost $ 1,260 $ 1,211 $ 1,314
Interest cost 607 720 615
Expected return on plan assets (1,267) (1,057) (1,011)
Amortization of actuarial losses 309 175 407
Net periodic benefit cost 909 1,049 1,325
Other changes in plan assets and benefit obligations recognized in other comprehensive income:      
Net actuarial (gain) loss (654) 1,782 (2,303)
Amortization of actuarial losses (406) (156) (396)
Amount recognized in other comprehensive income (1,060) 1,626 (2,699)
Total recognized in net periodic benefit cost and other comprehensive income $ (151) $ 2,675 $ (1,374)