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Benefit Plans - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) Plan shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Compensation And Retirement Disclosure [Abstract] |  |  |
Employer discretionary contribution amount | $ 8,300,000 | $ 5,300,000 | $ 5,900,000
Number of non-contributory defined benefit pension plans | Plan | 2 |  |
Period of average compensation for pension benefit computation | 5 years |  |
Deferred compensation arrangement with Individual, recorded liability | $ 8,900,000 |  |
Deferred compensation arrangement with individual, value of shares issued | $ 8,925,065 |  |
Deferred compensation arrangement with individual, shares issued | shares | 553,665 |  |
Long-term portion of the pension liability | $ 33,200,000 | 37,200,000 |
AOCI net prior service cost | 10,900,000 |  |
Future amortization of prior service cost | $ 800,000 |  |
Retirement age | 65 years |  |
Rabbi trust balance | $ 35,700,000 |  |
Expense related to contributions | 100,000 | 100,000 | $ 100,000
Total deferred compensation liability | 36,900,000 | 29,500,000 |
Deferred compensation liability, current | $ 2,000,000.0 | $ 1,500,000 |

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