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Pensions and Other Post-retirement Benefits - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated contributions by employer to pension plans | $ 7,700 |  |
Percentage increase in health care benefit cost |  | 6.50% |
Percentage decrease in health care benefits for successive year | 0.20% | 0.50% |
Estimated future percentage of health care benefits | 4.50% | 4.50% |
Increase in costs of covered health care benefits | 5.90% |  |
Defined contribution pension plan expense | $ 10,600 | $ 8,300 | $ 9,000
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 10,082 | 3,382 | 5,901
Service cost | 12,094 | 10,342 | 11,125
Estimated benefit payments, year one | 26,100 |  |
Estimated benefit payments, year two | 27,000 |  |
Estimated benefit payments, year three | 28,200 |  |
Estimated benefit payments, year four | 28,800 |  |
Estimated benefit payments, year five | 29,900 |  |
Estimated benefit payments, five years thereafter | 155,900 |  |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 1,863 | 1,814 | 1,509
Service cost | 396 | $ 354 | $ 369
Estimated benefit payments, year one | 2,800 |  |
Estimated benefit payments, year two | 2,700 |  |
Estimated benefit payments, year three | 2,300 |  |
Estimated benefit payments, year four | 2,400 |  |
Estimated benefit payments, year five | 2,200 |  |
Estimated benefit payments, five years thereafter | $ 10,300 |  |

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