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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 11,125 $ 11,023 $ 10,417
Interest cost 17,214 18,450 18,752
Expected return on plan assets (36,352) (35,417) (34,751)
Amortization of transition amounts 1 2 2
Amortization of prior service credit (21) (19) (14)
Recognized net actuarial losses 13,755 12,955 11,921
Settlement/curtailment loss (credit) 179 148 5
Special termination charge 0 11,384 0
Net periodic benefit cost(a) 5,901 18,526 6,332
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 369 403 426
Interest cost 793 882 946
Expected return on plan assets 0 0 0
Amortization of transition amounts 0 0 0
Amortization of prior service credit (405) (307) (419)
Recognized net actuarial losses 752 100 68
Settlement/curtailment loss (credit) 0 (562) 0
Special termination charge 0 0 0
Net periodic benefit cost(a) $ 1,509 $ 516 $ 1,021