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Postretirement Benefit Plans - Company's Asset Allocations for its U.K. Pension Plans by Asset Category (Detail) - United Kingdom [Member] - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 14,175 | $ 16,091 | $ 15,163
Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 13,542 | 15,331 |
Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 633 | 760 |
Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 941 | 1,308 |
Cash [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 941 | 1,308 |
Pooled Pension Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,691 | 1,017 |
Pooled Pension Funds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,691 | 1,017 |
Pooled Fixed Pension Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10,825 | 12,860 |
Pooled Fixed Pension Funds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10,825 | 12,860 |
Real Estate Pooled Pension Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 85 | 146 |
Real Estate Pooled Pension Funds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 85 | 146 |
Insurance Contracts [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 633 | 760 |
Insurance Contracts [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 633 | $ 760 |

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