Employee Benefit Plans (Detail) - Assumed Average Annual Rate of Increase in the Per Capita Cost of Covered Benefits	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Post-Retirement Benefit Plan Pre-Age 65 [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care cost trend rate	8.00%	8.00%
Ultimate trend rate	5.00%	5.00%
Year rate reaches ultimate trend rate	2028	2027
Post-Retirement Benefit Plan Age 65 and Older [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care cost trend rate	7.00%	6.50%
Ultimate trend rate	5.00%	5.00%
Year rate reaches ultimate trend rate	2024	2021

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.

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=35743120&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

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- Definition

The ultimate trend rate for health care costs.

+ References

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- Definition

Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

+ References

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