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Retirement Plans and Other Postretirement Benefits - Amounts Recognized in Accumulated Other Comprehensive Income, Net of Taxes (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Defined Benefit Plan Disclosure [Line Items] |  |
Total recognized | $ 253,720 | $ 246,891
Net actuarial loss |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total recognized | 249,468 | 242,696
Prior service costs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total recognized | 4,247 | 4,189
Transition asset |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total recognized | $ 5 | $ 6

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