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Pensions and Other Post-retirement Benefits - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated contributions by employer to pension plans | $ 7,100 |  |
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% | 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 | $ 1,000 |  |
Increase or decrease in current year plan expense | 130 |  |
Defined contribution pension plan expense | $ 9,000 | $ 8,100 | $ 5,100
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) | $ 5,901 | 18,526 | 6,332
Service cost | 11,125 | 11,023 | 10,417
Estimated benefit payments, year one | 29,800 |  |
Estimated benefit payments, year two | 24,800 |  |
Estimated benefit payments, year three | 25,700 |  |
Estimated benefit payments, year four | 26,400 |  |
Estimated benefit payments, year five | 27,300 |  |
Estimated benefit payments, five years thereafter | 145,100 |  |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 1,509 | 516 | 1,021
Service cost | 369 | $ 403 | $ 426
Estimated benefit payments, year one | 2,800 |  |
Estimated benefit payments, year two | 2,700 |  |
Estimated benefit payments, year three | 2,800 |  |
Estimated benefit payments, year four | 2,600 |  |
Estimated benefit payments, year five | 2,300 |  |
Estimated benefit payments, five years thereafter | 10,300 |  |
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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