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