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Assumptions Used to Determine Benefit Obligations (Detail) | Dec. 31, 2013 | Dec. 31, 2012
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Pension benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 4.75% | 3.75%
Long-term rate of compensation increase | 4.50% | 4.50%
Other post-retirement benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 4.75% | 3.75%
Long-term rate of compensation increase | 4.50% | 4.50%

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- Definition The interest rate used to adjust for the time value of money for the plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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