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Employee Benefits - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Retirement Benefits [Abstract] |  |  |
Maximum percentage of a participant's eligible compensation that a participating may elect to contribute, on a tax-deferred annually to the plan (as a percent) | 80.00% |  |
Percentage of matching contribution made by company, of first 6.0% of participating employees contributions (as a percent) | 50.00% |  |
Percentage of participating employees contribution, matched 100% (as a percent) | 6.00% |  |
Employer contribution | $ 12,200 | $ 11,100 | $ 10,800
Non-qualified deferred income (expense) of investment | 15,400 | 19,200 | $ (4,900)
Non-qualified deferred compensation plan assets | 127,332 | 106,851 |
Non-qualified deferred compensation plan liabilities | $ 127,332 | $ 106,851 |

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- Definition Defined contribution plan percentage of base compensation. + References No definition available. + Details
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- Definition Non-qualified deferred compensation plan gain loss on investments. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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