Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Defined Benefit Plan Disclosure [Line Items] | ||
| Net periodic benefit cost | $ (31) | $ (255) |
| United States [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Interest cost | 1,646 | 1,700 |
| Expected return on plan assets | (1,848) | (2,002) |
| Amortization of net actuarial loss (gain) | 108 | (19) |
| Net periodic benefit cost | (94) | (321) |
| United Kingdom [Member] | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Interest cost | 179 | 168 |
| Expected return on plan assets | (202) | (194) |
| Amortization of net actuarial loss (gain) | 85 | 92 |
| Net periodic benefit cost | $ 62 | $ 66 |
| X | ||||||||||
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|