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Fair Value of Plan Assets by Asset Category (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 691,063 | $ 633,261
Equity Securities | United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 330,506 | 302,169
Equity Securities | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 69,811 | 62,770
Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | 286,422 | 264,158
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Plan Assets | $ 4,324 | $ 4,164

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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 (b) -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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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