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, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Total	$ 15,163	$ 27,464	$ 28,504
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	14,486	26,461
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	677	1,003
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,448	2,414
Cash [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,448	2,414
Pooled Pension Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,688	3,715
Pooled Pension Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,688	3,715
Pooled Fixed Pension Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	11,350	20,332
Pooled Fixed Pension Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	11,350	20,332
Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	677	1,003
Insurance Contracts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	$ 677	$ 1,003