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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | $ 433,262 | $ 419,088 |
Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 304,460 | 280,619 |
Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 87,776 | 100,067 |
Pooled investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 20,156 | 19,345 |
Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 14,948 | 13,681 |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 5,922 | 5,376 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 273,192 | 260,470 |
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 | 242,161 | 225,191 |
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 | 25,109 | 29,903 |
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 | 5,922 | 5,376 |
Significant Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 145,122 | 144,937 |
Significant Observable Inputs (Level 2) | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 62,299 | 55,428 |
Significant Observable Inputs (Level 2) | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 62,667 | 70,164 |
Significant Observable Inputs (Level 2) | Pooled investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 20,156 | 19,345 |
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 | 14,948 | 13,681 |
Significant Unobservable Inputs (Level 3) | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
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 | 14,948 | 13,681 | $ 15,069
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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