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Pension Plans and Other Postretirement Benefits - Estimated Amounts to Be Amortized from Accumulated Other Comprehensive Income into Net Periodic Benefit Costs (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 Total Postretirement Benefits | Dec. 31, 2012 Total Postretirement Benefits | Dec. 31, 2011 Total Postretirement Benefits | Dec. 31, 2013 Total Pension Benefits | Dec. 31, 2012 Total Pension Benefits | Dec. 31, 2011 Total Pension Benefits | Dec. 31, 2013 Domestic Pension Benefits | Dec. 31, 2012 Domestic Pension Benefits | Dec. 31, 2011 Domestic Pension Benefits | Dec. 31, 2014 Forecast for 2013 Total Postretirement Benefits | Dec. 31, 2014 Forecast for 2013 Total Pension Benefits | Dec. 31, 2014 Forecast for 2013 Domestic Pension Benefits
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service benefit | $ (95) | $ (95) | $ (697) | $ (689) | $ (757) | $ (953) | $ (741) | $ (812) | $ (1,009) | $ (95) | $ (689) | $ (741)

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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration