Pensions and Other Post-retirement Benefits - Schedule of Expected Return on Assets for Net Periodic Pension Cost (Detail)	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Plan assets, actual allocation	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, actual allocation	59.00%	65.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, actual allocation	33.00%	26.00%
Pooled investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets, actual allocation	7.00%	7.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets, actual allocation	1.00%	1.00%
Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets, actual allocation	0.00%	1.00%