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Pensions and Other Post-retirement Benefits - Summary of Pension Plan Assets Measured at Fair Value on Recurring Basis by Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | $ 419,088 | $ 445,299 |
Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 280,619 | 288,018 |
Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 100,067 | 114,364 |
Pooled investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 19,345 | 22,623 |
Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 13,681 | 15,069 |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 5,376 | 5,225 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 260,470 | 279,828 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 225,191 | 233,156 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 29,903 | 41,447 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pooled investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 5,376 | 5,225 |
Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 144,937 | 149,649 |
Significant Observable Inputs (Level 2) | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 55,428 | 54,614 |
Significant Observable Inputs (Level 2) | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 70,164 | 72,412 |
Significant Observable Inputs (Level 2) | Pooled investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 19,345 | 22,623 |
Significant Observable Inputs (Level 2) | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
Significant Observable Inputs (Level 2) | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 13,681 | 15,822 |
Significant Unobservable Inputs (Level 3) | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 248 |
Significant Unobservable Inputs (Level 3) | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 505 |
Significant Unobservable Inputs (Level 3) | Pooled investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 13,681 | 15,069 | $ 13,512
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | $ 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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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