Weighted-Average Assumptions Used in Determining (Detail)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Benefits, Defined Benefit \| United States And Puerto Rico Nonqualified Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.09%	4.36%
Rate of compensation increase	3.75%	3.75%
Discount rate	4.36%	4.00%	4.85%
Expected return on plan assets	7.00%	7.25%	7.50%
Rate of compensation increase	3.75%	3.76%	3.80%
Pension Benefits, Defined Benefit \| International Unfunded Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.05%	2.60%
Rate of compensation increase	3.08%	3.37%
Discount rate	2.60%	2.26%	3.41%
Expected return on plan assets	6.07%	6.20%	6.02%
Rate of compensation increase	3.37%	3.33%	3.29%
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Annual rate of increase in the per-capita cost	6.25%	6.50%
Rate decreased to	5.00%	5.00%
by the year ended	2022	2022
Annual rate of increase in the per-capita cost	6.50%	6.00%	6.25%
Rate decreased to	5.00%	5.00%	5.00%
by the year ended	2022	2019	2019
Other Postretirement Benefit Plans, Defined Benefit \| United States And Puerto Rico Nonqualified Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.89%	4.12%
Discount rate	4.12%	3.95%	4.90%

Defined benefit plan assumptions used calculating benefit obligation annual rate decrease in per capita cost.

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- Definition

Defined benefit plan assumptions used calculating benefit obligation annual rate decrease in per capita cost by the year ended.

+ References

No definition available.

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- Definition

Defined benefit plan assumptions used calculating benefit obligation annual rate of per capita cost increase

+ References

No definition available.

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- Definition

Defined benefit plan assumptions used calculating net periodic benefit cost annual rate decrease in per capita cost.

+ References

No definition available.

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- Definition

Defined benefit plan assumptions used calculating net periodic benefit cost annual rate of decrease in per capita cost by the year ended.

+ References

No definition available.

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- Definition

Defined benefit plan assumptions used calculating net periodic benefit cost annual rate of increase in per capita cost.

+ References

No definition available.

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- Definition

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

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=65897934&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=65897934&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
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

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-Publisher FASB
-Name Accounting Standards Codification
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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=65897934&loc=d3e1928-114920

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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.

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