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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 | Dec. 31, 2012 | Dec. 31, 2011
Total Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of prior service benefit | $ (95) | $ (95) | $ (697)
Total Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of prior service benefit | (689) | (757) | (953)
Domestic Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of prior service benefit | (741) | (812) | (1,009)
Forecast for 2013 | Total Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of prior service benefit | (95) |  |
Forecast for 2013 | Total Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of prior service benefit | (689) |  |
Forecast for 2013 | Domestic Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of prior service benefit | $ (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=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Period Type: | duration

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- Details
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