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Pension and Employee Benefit Plans - Components of Pension and Employee Benefit Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 326 $ 298 $ 977 $ 893
Expected return on plan assets (313) (378) (940) (1,134)
Amortization of net actuarial loss 65 59 198 178
Net periodic benefit cost (gain) 78 (21) 235 (63)
Health Care Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 1 1 2 2
Amortization of loss 2 2 6 7
Net periodic benefit cost (gain) $ 3 $ 3 $ 8 $ 9