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Retirement Plans and Other Postretirement Benefits - Fair Value of Plan Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 774,329 | $ 728,641
U.S. Defined Benefit Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 599,886 | 569,049
U.S. Defined Benefit Pension Plans | Municipal bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,253 | 711
U.S. Defined Benefit Pension Plans | Corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 5,295 | 6,192
U.S. Defined Benefit Pension Plans | Corporate debt instruments – Preferred |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 16,004 | 13,425
U.S. Defined Benefit Pension Plans | Corporate stocks – Common |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 43,287 | 53,629
U.S. Defined Benefit Pension Plans | Registered investment companies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 169,794 | 155,541
U.S. Defined Benefit Pension Plans | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,262 | 1,253
U.S. Defined Benefit Pension Plans | Total investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 236,895 | 230,751
U.S. Defined Benefit Pension Plans | Investments measured at net asset value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 362,991 | 338,298
Level 1 | U.S. Defined Benefit Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 213,081 | 209,170
Level 1 | U.S. Defined Benefit Pension Plans | Municipal bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | U.S. Defined Benefit Pension Plans | Corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | U.S. Defined Benefit Pension Plans | Corporate debt instruments – Preferred |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | U.S. Defined Benefit Pension Plans | Corporate stocks – Common |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 43,287 | 53,629
Level 1 | U.S. Defined Benefit Pension Plans | Registered investment companies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 169,794 | 155,541
Level 1 | U.S. Defined Benefit Pension Plans | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | U.S. Defined Benefit Pension Plans | Total investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 213,081 | 209,170
Level 1 | U.S. Defined Benefit Pension Plans | Investments measured at net asset value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 | U.S. Defined Benefit Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 23,814 | 21,581
Level 2 | U.S. Defined Benefit Pension Plans | Municipal bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,253 | 711
Level 2 | U.S. Defined Benefit Pension Plans | Corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 5,295 | 6,192
Level 2 | U.S. Defined Benefit Pension Plans | Corporate debt instruments – Preferred |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 16,004 | 13,425
Level 2 | U.S. Defined Benefit Pension Plans | Corporate stocks – Common |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 | U.S. Defined Benefit Pension Plans | Registered investment companies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 | U.S. Defined Benefit Pension Plans | U.S. Government securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,262 | 1,253
Level 2 | U.S. Defined Benefit Pension Plans | Total investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 23,814 | 21,581
Level 2 | U.S. Defined Benefit Pension Plans | Investments measured at net asset value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 0 | $ 0

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