Weighted Average Assumptions Used to Determine Benfit Obligations (Detail)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plans, Defined Benefit
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	3.20%	2.80%	4.00%
Rate of compensation increase	2.70%	2.70%	2.80%
Other Postretirement Benefit Plans, Defined Benefit
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	4.80%	3.50%	4.00%
Health care cost trend	8.50%	8.00%	7.50%
Ultimate health care cost trend	5.00%	5.00%	5.00%
defined benefit plan, ultimate health care cost trend rate years reached	8 years	7 years	6 years

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

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- Definition

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

+ References

+ Details

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ 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 (l)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

-URI http://asc.fasb.org/extlink&oid=6514820

+ Details

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- Definition

The ultimate trend rate for health care costs.

+ References

+ Details

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- Definition

defined benefit plan, ultimate health care cost trend rate years reached

+ References

No definition available.

+ Details

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