Postretirement Benefit Plans - Weighted-Average Assumptions used to Determine Benefit Obligations (Detail)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cost Assumptions:
Expected return on plan assets	8.00%	8.00%	8.00%
U.S. Pension Plans [Member]
Obligation Assumptions:
Discount rate	4.00%	4.80%
Cost Assumptions:
Discount rate	4.80%	4.10%
Expected return on plan assets	8.00%	8.00%
International Pension Plan [Member]
Obligation Assumptions:
Discount rate	1.90%	3.20%
Rate of future compensation increase	3.30%	3.40%
Cost Assumptions:
Discount rate	3.20%	3.10%
Expected return on plan assets	4.70%	4.70%
Other Postretirement Benefit Plan [Member]
Obligation Assumptions:
Discount rate	3.80%	4.70%
Cost Assumptions:
Discount rate	4.70%	4.10%
Expected return on plan assets	8.00%	8.00%

The interest rate used to adjust for the time value of money for the 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 (k)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ 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)(2)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

The interest rate used to adjust for the time value of money.

+ References

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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