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Weighted Average Asset Allocations by Asset Category (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation	100.00%	100.00%
Target Asset Allocation	100.00%
Equity Securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation	34.00%	39.00%
Target Asset Allocation	36.00%
Debt Securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation	37.00%	36.00%
Target Asset Allocation	41.00%
Insurance (annuity) contracts
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation	13.00%	11.00%
Target Asset Allocation	13.00%
Real Estate
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation	6.00%	5.00%
Target Asset Allocation	3.00%
Other
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation	10.00%	9.00%
Target Asset Allocation	7.00%

X

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ 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 (d)(i)

-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

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

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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=28361610&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=28361610&loc=d3e1928-114920

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