Defined Contribution Plans, Pension and Other Post-Retirement Benefit Plans - Current Investment Allocation Target for Pension Plans and Weighted-Average Asset Allocations (Detail)	Dec. 31, 2017	Dec. 31, 2016
U.S. Pension and Other Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation	100.00%	100.00%
Weighted-average pension plans allocation	99.90%	100.00%
Non-U.S. Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation	100.00%	100.00%
Weighted-average pension plans allocation	100.00%	100.00%
Cash and cash equivalents \| U.S. Pension and Other Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation	0.00%	0.00%
Weighted-average pension plans allocation	0.00%	0.00%
Cash and cash equivalents \| Non-U.S. Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation	0.00%	0.00%
Weighted-average pension plans allocation	0.00%	0.00%
Equity/Balanced securities \| U.S. Pension and Other Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation	55.00%	55.00%
Weighted-average pension plans allocation	57.00%	52.00%
Equity/Balanced securities \| Non-U.S. Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation	55.00%	55.00%
Weighted-average pension plans allocation	58.00%	55.00%
Fixed income securities \| U.S. Pension and Other Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation	25.00%	25.00%
Weighted-average pension plans allocation	20.00%	23.00%
Fixed income securities \| Non-U.S. Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation	45.00%	45.00%
Weighted-average pension plans allocation	42.00%	45.00%
Real estate \| U.S. Pension and Other Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation	20.00%	20.00%
Weighted-average pension plans allocation	23.00%	25.00%
Real estate \| Non-U.S. Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target Allocation	0.00%	0.00%
Weighted-average pension plans allocation	0.00%	0.00%

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(i)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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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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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

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