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Postretirement Benefit Plans - Defined Benefit Pension Plans - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($)
U.S Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | $ 2,100,000 | $ 2,100,000
Expected payment related to qualified plan | 0 | 0
Expected payment related to non-qualified plan | 312,000 | 312,000
Payments related to non-qualified plans | 256,000 | 256,000
U.K Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions |  | 281,000
Expected payment related to qualified plan | $ 360,000 | $ 360,000

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