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Postretirement Benefit Plans - Weighted-Average Assumptions Used To Determine Benefit Obligations (Detail) | Dec. 31, 2017 | Dec. 31, 2016
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United States [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Discount rate | 3.67% | 4.17%
United Kingdom [Member] |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Discount rate | 2.40% | 2.60%

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- Definition Pension plans postretirement and other employee benefits. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Details
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- Details
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