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Postretirement Benefit Plans - Asset Allocation Range (Detail) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 37.00% | 35.00%
Minimum range | 30.00% | 30.00%
Maximum range | 40.00% | 40.00%
International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 30.00% | 29.00%
Minimum range | 20.00% | 20.00%
Maximum range | 40.00% | 40.00%
Fixed income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 32.00% | 35.00%
Minimum range | 25.00% | 25.00%
Maximum range | 45.00% | 45.00%
Cash and other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual allocation | 1.00% | 1.00%
Minimum range | 0.00% | 0.00%
Maximum range | 5.00% | 5.00%

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- Definition Target allocation maximum percentage 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 + Details
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- Definition Target allocation minimum percentage 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 + Details
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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 + Details
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