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Pensions and Other Post-retirement Benefits - Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 12,094 $ 10,342 $ 11,125
Interest cost 14,905 18,803 17,214
Expected return on plan assets (34,029) (38,644) (36,352)
Amortization of transition amounts 0 2 1
Amortization of prior service cost (credit) 178 223 (21)
Recognized net actuarial losses 15,799 10,159 13,755
Settlement/curtailment loss 1,135 2,497 179
Net periodic benefit cost(a) 10,082 3,382 5,901
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 396 354 369
Interest cost 716 996 793
Expected return on plan assets 0 0 0
Amortization of transition amounts 0 0 0
Amortization of prior service cost (credit) (394) (405) (405)
Recognized net actuarial losses 1,145 869 752
Settlement/curtailment loss 0 0 0
Net periodic benefit cost(a) $ 1,863 $ 1,814 $ 1,509