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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 28,504 | $ 24,357 | $ 20,576
Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 252 |
Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 27,345 | 22,900 |
Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,159 | 1,205 |
Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2,576 | 1,372 |
Cash [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 252 |
Cash [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2,576 | 1,120 |
Pooled Pension Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 3,603 | 7,533 |
Pooled Pension Funds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 3,603 | 7,533 |
Pooled Fixed Pension Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 21,166 | 14,247 |
Pooled Fixed Pension Funds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 21,166 | 14,247 |
Insurance Contracts [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,159 | 1,205 |
Insurance Contracts [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 1,159 | $ 1,205 |

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