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Schedule of Weighted Average Pension Assets Allocations by Category (Detail)	Dec. 31, 2017	Dec. 31, 2016
United States Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Total	100.00%	100.00%
United States Pension Plans, Defined Benefit | Fixed income securities
Defined Benefit Plan Disclosure
Total	88.10%	88.10%
United States Pension Plans, Defined Benefit | Equity securities
Defined Benefit Plan Disclosure
Total	9.90%	9.90%
United States Pension Plans, Defined Benefit | Other than Securities Investment
Defined Benefit Plan Disclosure
Total	2.00%	2.00%
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Total	100.00%	100.00%
Foreign Pension Plans, Defined Benefit | Other than Securities Investment
Defined Benefit Plan Disclosure
Total	100.00%	100.00%

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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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