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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) - Pension Plan - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | $ 492,677 | $ 433,262 | $ 419,088
Fair Value, Measurements, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 492,677 | 433,262 |
Plan assets at NAV | 132,828 | 87,481 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 255,665 | 267,961 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 86,350 | 62,872 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 17,834 | 14,948 |
Fair Value, Measurements, Recurring | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 278,606 | 304,460 |
Plan assets at NAV | 64,840 | 62,094 |
Fair Value, Measurements, Recurring | Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 213,766 | 242,161 |
Fair Value, Measurements, Recurring | Equity securities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 205 |
Fair Value, Measurements, Recurring | Equity securities | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 127,128 | 87,776 |
Fair Value, Measurements, Recurring | Fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 40,778 | 25,109 |
Fair Value, Measurements, Recurring | Fixed income securities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 86,350 | 62,667 |
Fair Value, Measurements, Recurring | Fixed income securities | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Pooled investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 60,014 | 20,156 |
Plan assets at NAV | 60,014 | 20,156 |
Fair Value, Measurements, Recurring | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 17,834 | 14,948 |
Fair Value, Measurements, Recurring | Insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Insurance contracts | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Insurance contracts | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 17,834 | 14,948 |
Fair Value, Measurements, Recurring | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 9,095 | 5,922 |
Plan assets at NAV | 7,974 | 5,231 |
Fair Value, Measurements, Recurring | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 1,121 | 691 |
Fair Value, Measurements, Recurring | Cash and cash equivalents | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Cash and cash equivalents | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets measured at fair value | $ 0 | $ 0 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=82843861&loc=d3e1928-114920 + Details
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