Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Share-Based Compensation - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) Plan shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum contractual life	10 years
Unrecognized share-based payment expense \| $	$ 49.9
Weighted average period expected to be recognized	2 years 4 months 24 days
Stock Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Requisite service period for stock award	1 year
Stock Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period for stock award	4 years
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period expected to be recognized	2 years 1 month 6 days
Estimated outstanding RSU \| shares	646,553
Unrecognized share-based payment expense related to nonvested stock options \| $	$ 44.8
Fair value of RSUs vesting during the year \| $	$ 33.2	$ 26.3	$ 18.7
RSUs [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Requisite service period for stock award	1 year
RSUs [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Requisite service period for stock award	4 years
2009 Plan and the Stock Plan for Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity compensation plans \| Plan	2
Number of common stock registered for award \| shares	44,100,000
Shares available for future grants \| shares	6,100,000