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Pension Plans - Fair Value of the Company's Pension Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | $ 22,499 | $ 18,406 | $ 15,077
Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 1,127 | 464 |
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 7,455 | 6,121 |
U.S. Treasury Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 4,161 | 4,205 |
Mutual Funds-Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 6,776 | 4,944 |
Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 2,950 | 2,640 |
Mortgage-Backed Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 30 | 32 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 19,519 | 15,734 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 1,127 | 464 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 7,455 | 6,121 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | U.S. Treasury Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 4,161 | 4,205 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | Mutual Funds-Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 6,776 | 4,944 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | Mortgage-Backed Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 2,980 | 2,672 |
Significant Observable Inputs (Level 2) [Member] | Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Observable Inputs (Level 2) [Member] | U.S. Treasury Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Observable Inputs (Level 2) [Member] | Mutual Funds-Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Observable Inputs (Level 2) [Member] | Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 2,950 | 2,640 |
Significant Observable Inputs (Level 2) [Member] | Mortgage-Backed Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 30 | 32 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Mutual Funds-Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Mortgage-Backed Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | $ 0 | $ 0 |

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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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