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Percentage of Fair Value of Pension Plan Assets (Detail) - Pension Plans | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
U.S. Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 100.00% | 100.00%
U.S. Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 15.00% | 33.00%
U.S. Pension Plans | Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 85.00% | 63.00%
U.S. Pension Plans | Real Estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 0.00% | 4.00%
U.S. Pension Plans | Hedge Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 0.00% | 0.00%
U.S. Pension Plans | Private Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 0.00% | 0.00%
U.S. Pension Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 0.00% | 0.00%
Non-U.S. Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 100.00% | 100.00%
Non-U.S. Pension Plans | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 28.00% | 29.00%
Non-U.S. Pension Plans | Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 60.00% | 57.00%
Non-U.S. Pension Plans | Real Estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 6.00% | 5.00%
Non-U.S. Pension Plans | Hedge Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 4.00% | 6.00%
Non-U.S. Pension Plans | Private Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 1.00% | 2.00%
Non-U.S. Pension Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 1.00% | 1.00%

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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