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Retirement Plans and Other Postretirement Benefits - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of minimum employee contributions | 20.00% |  |
Percentage of maximum employee contributions | 100.00% |  |
Percentage of employee contributions for eligible compensation, Minimum | 1.00% |  |
Percentage of employee contributions for eligible compensation, Maximum | 8.00% |  |
Defined benefit plan contributions by employer employee match | $ 1,200 |  |
Market share of treasury stock held (in shares) | 384,788 | 384,788 |
Market value of treasury stock held | $ 46,500,000 | $ 38,400,000 |
Percentage of equity securities in company common stock included in plan assets | 7.00% | 6.20% |
Estimated future benefit payments, 2021 | $ 43,200,000 |  |
Estimated future benefit payments, 2022 | 43,100,000 |  |
Estimated future benefit payments, 2023 | 44,200,000 |  |
Estimated future benefit payments, 2024 | 44,600,000 |  |
Estimated future benefit payments, 2025 | 44,300,000 |  |
Estimated future benefit payments, 2026-2030 | 220,900,000 |  |
Amount deferred under the compensation plan, including income earned | 25,100,000 | $ 19,000,000.0 |
Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan estimated future employer contributions in next fiscal year | 6,000,000 |  |
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan estimated future employer contributions in next fiscal year | $ 10,000,000 |  |
U.S. Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term return on plan assets | 7.00% | 7.50% | 7.50%
Assumed rate of return next year | 6.75% |  |
U.S. Defined Benefit Pension Plans | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations for the U.S. and foreign benefits plans | 50.00% |  |
U.S. Defined Benefit Pension Plans | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations for the U.S. and foreign benefits plans | 20.00% |  |
U.S. Defined Benefit Pension Plans | Other Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations for the U.S. and foreign benefits plans | 30.00% |  |
Foreign Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term return on plan assets | 5.97% | 6.52% | 6.52%
Assumed rate of return next year | 5.47% |  |
Foreign Defined Benefit Pension Plans | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations for the U.S. and foreign benefits plans | 22.00% |  |
Foreign Defined Benefit Pension Plans | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations for the U.S. and foreign benefits plans | 21.00% |  |
Foreign Defined Benefit Pension Plans | Other Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations for the U.S. and foreign benefits plans | 6.00% |  |
Foreign Defined Benefit Pension Plans | Multi Asset Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocations for the U.S. and foreign benefits plans | 51.00% |  |

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