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Pension and Other Postretirement Benefits - Fair Values of Pension Plan Assets by Asset Category (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | $ 198,367 | $ 173,154
Large-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 75,306 | 62,151
Mid-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 13,511 | 11,581
Small-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 19,473 | 15,955
Government bond fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 25,520 | 24,385
Corporate bond fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 21,679 | 21,819
Fixed income fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 42,847 | 37,231
Cash & equivalents [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 31 | 32
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 31 | 32
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Large-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mid-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Small-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Government bond fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate bond fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed income fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash & equivalents [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 31 | 32
Significant Observable Inputs (Level 2) [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 198,336 | 173,122
Significant Observable Inputs (Level 2) [Member] | Large-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 75,306 | 62,151
Significant Observable Inputs (Level 2) [Member] | Mid-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 13,511 | 11,581
Significant Observable Inputs (Level 2) [Member] | Small-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 19,473 | 15,955
Significant Observable Inputs (Level 2) [Member] | Government bond fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 25,520 | 24,385
Significant Observable Inputs (Level 2) [Member] | Corporate bond fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 21,679 | 21,819
Significant Observable Inputs (Level 2) [Member] | Fixed income fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category | 42,847 | 37,231
Significant Observable Inputs (Level 2) [Member] | Cash & equivalents [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Significant Unobservable Inputs (Level 3) [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Significant Unobservable Inputs (Level 3) [Member] | Large-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Significant Unobservable Inputs (Level 3) [Member] | Mid-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Significant Unobservable Inputs (Level 3) [Member] | Small-cap fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Significant Unobservable Inputs (Level 3) [Member] | Government bond fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Significant Unobservable Inputs (Level 3) [Member] | Corporate bond fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Significant Unobservable Inputs (Level 3) [Member] | Fixed income fund [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |
Significant Unobservable Inputs (Level 3) [Member] | Cash & equivalents [Member] |  |
Pension And Other Employee Benefit Plans [Line Items] |  |
Fair values of pension plan assets by asset category |  |

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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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