Pension Plans and Other Postretirement Benefits - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Net loss (gain)	$ (84,522)	$ (206,274)
Net prior service cost	13,260
Amortization of prior service (cost) credit	2,256	4,185	$ 4,181
Amortization of actuarial (loss) gain	(18,414)	(87,722)	$ (56,860)
Total recognized in other comprehensive income, pre-tax	(87,420)	(289,811)
Pension Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Net loss (gain)	(62,787)	(204,042)
Amortization of prior service (cost) credit	(516)	(553)
Amortization of actuarial (loss) gain	(19,895)	(89,017)
Total recognized in other comprehensive income, pre-tax	(83,198)	(293,612)
Other Postretirement Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Net loss (gain)	(21,735)	(2,232)
Net prior service cost	13,260
Amortization of prior service (cost) credit	2,772	4,738
Amortization of actuarial (loss) gain	1,481	1,295
Total recognized in other comprehensive income, pre-tax	$ (4,222)	$ 3,801