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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 20,576 | $ 24,168 | $ 20,336
Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 205 | 745 |
Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 19,128 | 21,725 |
Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,243 | 1,698 |
Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 205 | 745 |
Cash [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 205 | 745 |
Pooled Pension Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 12,750 | 14,127 |
Pooled Pension Funds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 12,750 | 14,127 |
Pooled Fixed Pension Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 6,378 | 6,952 |
Pooled Fixed Pension Funds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 6,378 | 6,952 |
Real Estate Pooled Pension Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 646 |
Real Estate Pooled Pension Funds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 646 |
Insurance Contracts [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,243 | 1,698 |
Insurance Contracts [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 1,243 | $ 1,698 |

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