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, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Assumptions used to determine benefit obligations, average discount rate	4.75%	5.01%
Assumptions used to determine benefit obligations, rate of compensation increase	3.78%	4.61%
Assumptions used to determine net periodic benefit cost, average discount rate, service cost	5.23%	3.12%
Assumptions used to determine net periodic benefit cost, average discount rate, interest cost	4.91%	2.17%
Assumptions used to determine net periodic benefit cost, expected return on plan assets	6.86%	8.77%
Assumptions used to determine net periodic benefit cost, rate of compensation increase	4.61%	4.58%
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Assumptions used to determine benefit obligations, average discount rate	4.88%	5.09%
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	5.15%	2.84%
Assumptions used to determine net periodic benefit cost, average discount rate, interest cost	5.09%	2.04%
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%	2.91%