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Plan Assets Measured and Reported in Financial Statements at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 456,445 | $ 406,163
Collective trust funds | US equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 174,735 | 148,435
Collective trust funds | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 164,998 | 147,756
Collective trust funds | International fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 41,523 | 36,580
US government and US government agency securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 31,434 | 35,944
US corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 21,171 | 20,514
International corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 4,996 | 5,455
Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,741 | 5,083
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8,847 | 6,396
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,520 | 1,422
Level 1 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,520 | 1,422
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 454,925 | 404,741
Level 2 | Collective trust funds | US equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 174,735 | 148,435
Level 2 | Collective trust funds | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 164,998 | 147,756
Level 2 | Collective trust funds | International fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 41,523 | 36,580
Level 2 | US government and US government agency securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 31,434 | 35,944
Level 2 | US corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 21,171 | 20,514
Level 2 | International corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 4,996 | 5,455
Level 2 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 7,221 | 3,661
Level 2 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 8,847 | $ 6,396

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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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