Pensions and Other Post-retirement Benefits - Summary of Pension Plan Assets Measured at Fair Value on Recurring Basis by Fair Value Hierarchy (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Insurance contracts | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	$ 3,334	$ 5,622	$ 4,454
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Total	580,364	563,449	$ 514,218
Fair Value, Measurements, Recurring | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Total	580,364	563,449
NAV	104,893	104,639
Fair Value, Measurements, Recurring | Pension Plan | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	416,892	378,573
Fair Value, Measurements, Recurring | Pension Plan | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	55,245	74,615
Fair Value, Measurements, Recurring | Pension Plan | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	3,334	5,622
Fair Value, Measurements, Recurring | Pension Plan | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total	375,001	327,699
NAV	56,803	45,441
Fair Value, Measurements, Recurring | Pension Plan | Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	318,198	282,258
Fair Value, Measurements, Recurring | Pension Plan | Equity securities | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	0	0
Fair Value, Measurements, Recurring | Pension Plan | Equity securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	0	0
Fair Value, Measurements, Recurring | Pension Plan | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Total	152,258	169,321
NAV	0	0
Fair Value, Measurements, Recurring | Pension Plan | Fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	97,013	94,706
Fair Value, Measurements, Recurring | Pension Plan | Fixed income securities | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	55,245	74,615
Fair Value, Measurements, Recurring | Pension Plan | Fixed income securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	0	0
Fair Value, Measurements, Recurring | Pension Plan | Pooled investment funds
Defined Benefit Plan Disclosure [Line Items]
Total	42,182	50,553
NAV	42,182	50,553
Fair Value, Measurements, Recurring | Pension Plan | Pooled investment funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	0	0
Fair Value, Measurements, Recurring | Pension Plan | Pooled investment funds | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	0	0
Fair Value, Measurements, Recurring | Pension Plan | Pooled investment funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	0	0
Fair Value, Measurements, Recurring | Pension Plan | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Total	3,334	5,622
NAV	0	0
Fair Value, Measurements, Recurring | Pension Plan | Insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	0	0
Fair Value, Measurements, Recurring | Pension Plan | Insurance contracts | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	0	0
Fair Value, Measurements, Recurring | Pension Plan | Insurance contracts | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	3,334	5,622
Fair Value, Measurements, Recurring | Pension Plan | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total	7,589	10,254
NAV	5,908	8,645
Fair Value, Measurements, Recurring | Pension Plan | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Total	1,681	1,609
Fair Value, Measurements, Recurring | Pension Plan | Cash and cash equivalents | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Total	0	0
Fair Value, Measurements, Recurring | Pension Plan | Cash and cash equivalents | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Total	$ 0	$ 0