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Stock-based Compensation Plans - Additional Information 4 (Detail) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	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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Deferred compensation arrangement gain loss.

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Shares held in rabbi trust.

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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
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-SubTopic 10
-Section 50
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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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