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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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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