Pensions and Other Post-retirement Benefits - Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7,587	$ 12,281	$ 12,910
Interest cost	23,775	14,377	11,518
Expected return on plan assets	(39,639)	(49,646)	(37,368)
Amortization of prior service cost (credit)	161	139	164
Recognized net actuarial losses	186	11,704	17,458
Settlement/curtailment loss (gain)	15	(354)	(2,234)
Net periodic benefit cost	(7,915)	(11,499)	2,448
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	214	327	398
Interest cost	1,090	590	476
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(245)	(338)	(358)
Recognized net actuarial losses	550	1,242	1,597
Settlement/curtailment loss (gain)	0	0	0
Net periodic benefit cost	$ 1,609	$ 1,821	$ 2,113