Pensions and Other Post-retirement Benefits - Schedule of Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Assumptions used to determine benefit obligations, average discount rate	5.35%	4.75%
Assumptions used to determine benefit obligations, rate of compensation increase	2.96%	3.78%
Assumptions used to determine net periodic benefit cost, average discount rate, service cost	5.02%	5.23%
Assumptions used to determine net periodic benefit cost, average discount rate, interest cost	4.64%	4.91%
Assumptions used to determine net periodic benefit cost, expected return on plan assets	7.23%	6.86%
Assumptions used to determine net periodic benefit cost, rate of compensation increase	3.78%	4.61%
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Assumptions used to determine benefit obligations, average discount rate	5.49%	4.88%
Assumptions used to determine benefit obligations, rate of compensation increase	3.00%	3.00%
Assumptions used to determine net periodic benefit cost, average discount rate, service cost	4.96%	5.15%
Assumptions used to determine net periodic benefit cost, average discount rate, interest cost	4.85%	5.09%
Assumptions used to determine net periodic benefit cost, expected return on plan assets	0.00%	0.00%
Assumptions used to determine net periodic benefit cost, rate of compensation increase	3.00%	3.00%