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, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Total	$ 15,272	$ 14,175	$ 16,091
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	14,690	13,542
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	582	633
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,145	941
Cash [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,145	941
Pooled Pension Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,958	1,691
Pooled Pension Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,958	1,691
Pooled Fixed Pension Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	11,505	10,825
Pooled Fixed Pension Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	11,505	10,825
Real Estate Pooled Pension Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	82	85
Real Estate Pooled Pension Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	82	85
Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	582	633
Insurance Contracts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	$ 582	$ 633