Pension and Other Postretirement Benefits - Schedule of Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.03%	5.41%
Rate of compensation increase	3.77%	3.21%
Discount rate	5.34%	2.66%	1.91%
Expected long-term rate of return on plan assets	6.21%	4.94%	5.66%
Rate of compensation increase	3.21%	3.11%	2.58%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.19%	5.54%
Discount rate	5.45%	2.46%	1.99%