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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost $ 194 $ 259 $ 582 $ 775
Expected return on plan assets (378) (443) (1,133) (1,151)
Amortization of net actuarial loss 103 67 308 199
Net periodic benefit (gain) cost (81) (117) (243) (177)
Health Care Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 1 1 2 2
Amortization of loss 2 2 6 6
Net periodic benefit (gain) cost $ 3 $ 3 $ 8 $ 8