Pensions and Other Post-retirement Benefits - Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9,214	$ 7,587	$ 12,281
Interest cost	23,307	23,775	14,377
Expected return on plan assets	(42,832)	(39,639)	(49,646)
Amortization of prior service cost (credit)	142	161	139
Recognized net actuarial losses	1,103	186	11,704
Settlement/curtailment loss (gain)	919	15	(354)
Net periodic benefit cost	(8,147)	(7,915)	(11,499)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	176	214	327
Interest cost	994	1,090	590
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(184)	(245)	(338)
Recognized net actuarial losses	460	550	1,242
Settlement/curtailment loss (gain)	0	0	0
Net periodic benefit cost	$ 1,446	$ 1,609	$ 1,821