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Stock-based Compensation Plans - Additional Information 4 (Detail) - USD ($) $ in Thousands, shares in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract] |  |  |
Maximum percentage of employees contribution | 75.00% |  |
Maximum percentage of employers contribution in cash | 6.00% |  |
Employer contribution | $ 5,300 | $ 5,400 | $ 5,800
Deferred compensation plan vesting period | 3 years |  |
Deferred compensation plan | $ (12,541) | $ 15,472 | $ 18,631
Shares held in rabbi trust total | 6.1 | 3.2 |
Vested shares held in rabbi trust | 5.0 | 2.7 |

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- Definition Vested shares held in rabbi trust. + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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