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Pensions and Other Post-retirement Benefits - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Estimated contributions by employer to pension plans |  | $ 5,000 |  |
Percentage increase in health care benefit cost |  | 6.50% |  |
Percentage decrease in health care benefits for successive year |  | 0.50% | 0.50% |
Estimated future percentage of health care benefits |  | 4.50% |  |
Increase in costs of covered health care benefits |  | 6.50% |  |
Percentage of change in assumed health care cost trend rate |  | 1.00% |  |
Increase or decrease in other postretirement obligations |  | $ 760 |  |
Increase or decrease in current year plan expense |  | 100 |  |
Defined contribution pension plan expense |  | $ 8,100 | $ 5,100 | $ 6,800
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss), Immediate Recognition Percent Greater Than Actuarial Losses |  | 10.00% |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | $ 18,526 | 6,332 | 11,955
Service cost |  | 11,023 | 10,417 | 11,517
Estimated benefit payments, year one |  | 23,600 |  |
Estimated benefit payments, year two |  | 23,800 |  |
Estimated benefit payments, year three |  | 24,900 |  |
Estimated benefit payments, year four |  | 25,800 |  |
Estimated benefit payments, year five |  | 26,500 |  |
Estimated benefit payments, five years thereafter |  | 146,800 |  |
Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | 516 | 1,021 | 999
Service cost |  | 403 | $ 426 | $ 444
Estimated benefit payments, year one |  | 1,600 |  |
Estimated benefit payments, year two |  | 1,700 |  |
Estimated benefit payments, year three |  | 1,700 |  |
Estimated benefit payments, year four |  | 1,800 |  |
Estimated benefit payments, year five |  | 1,800 |  |
Estimated benefit payments, five years thereafter |  | $ 7,400 |  |
Scenario, Forecast | Change in Assumptions for Defined Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 1,800 |  |  |

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