Pensions and Other Post-retirement Benefits - Schedule of Expected Return on Assets for Net Periodic Pension Cost (Detail)	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets at December 31,	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets at December 31,	65.00%	58.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets at December 31,	26.00%	30.00%
Pooled investment funds
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets at December 31,	7.00%	9.00%
Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets at December 31,	1.00%	1.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets at December 31,	1.00%	2.00%