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Underlying Asset Split of Fund (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |
Total underlying asset split | 100.00% | 100.00%
Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total underlying asset split | 70.00% | 90.00%
Bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total underlying asset split | 30.00% | 10.00%

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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 + Details
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