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Stockholders' Equity - Summary of Exercise Price (Detail)
shares in Millions
3 Months Ended
Mar. 31, 2021
$ / shares
shares
$5.50 to $18.50 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Minimum $ 5.50
Range of Exercise Prices Maximum $ 18.50
Options Outstanding Shares | shares 0.2
Weighted Average Remaining Contractual Life 6 years 1 month 6 days
Weighted Average Exercise Price Per Share, Options Outstanding $ 10.71
Options Exercisable Shares | shares 0.1
Weighted Average Exercise Price Per Share, Options Exercisable $ 8.99
$18.51 to $30.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Minimum 18.51
Range of Exercise Prices Maximum $ 30.00
Options Outstanding Shares | shares 4.0
Weighted Average Remaining Contractual Life 7 years 4 months 24 days
Weighted Average Exercise Price Per Share, Options Outstanding $ 19.11
Options Exercisable Shares | shares 1.4
Weighted Average Exercise Price Per Share, Options Exercisable $ 20.03
$30.01 to $45.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Minimum 30.01
Range of Exercise Prices Maximum $ 45.00
Options Outstanding Shares | shares 0.9
Weighted Average Remaining Contractual Life 5 years 9 months 18 days
Weighted Average Exercise Price Per Share, Options Outstanding $ 36.44
Options Exercisable Shares | shares 0.9
Weighted Average Exercise Price Per Share, Options Exercisable $ 36.44
$5.50 to $45.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Minimum 5.50
Range of Exercise Prices Maximum $ 45.00
Options Outstanding Shares | shares 5.1
Weighted Average Remaining Contractual Life 7 years 2 months 12 days
Weighted Average Exercise Price Per Share, Options Outstanding $ 21.83
Options Exercisable Shares | shares 2.4
Weighted Average Exercise Price Per Share, Options Exercisable $ 25.68