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, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total	$ 27,464	$ 28,504	$ 24,357
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	26,461	27,345
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,003	1,159
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	2,414	2,576
Cash [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	2,414	2,576
Pooled Pension Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,715	3,603
Pooled Pension Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,715	3,603
Pooled Fixed Pension Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	20,332	21,166
Pooled Fixed Pension Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	20,332	21,166
Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,003	1,159
Insurance Contracts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	$ 1,003	$ 1,159