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Pension and Employee Benefit Plans - Components of Pension and Employee Benefit Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract]      
Service cost   $ 415 $ 447
Interest cost $ 1,190 1,314 1,426
Expected return on plan assets (1,511) (1,723) (1,829)
Net amortization and deferral 238 227 212
Net periodic benefit cost (income) $ (83) $ 233 $ 256