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Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	5,081,000	4,303,000
Aggregate intrinsic value of stock options exercised	$ 6.3
Total fair value of stock options vested	0.1
Expected future pre-tax compensation expense, nonvested stock options	$ 24.7
Weighted average period to recognize expected future pre-tax compensation expense (in years)	2 years
Nonvested restricted stock outstanding	800,000
Stock Options Granted Prior Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of stock options	7 years
Beginning in 2018 Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of stock options	10 years
Restricted Stock Granted Prior Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cliff vesting period	4 years
Non Employee Directors Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cliff vesting period	2 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period to recognize expected future pre-tax compensation expense (in years)	2 years
Vesting period	Restricted stock granted to employees prior to 2018 generally vests four years after the grant date (cliff vesting) and is subject to accelerated vesting due to certain events, including doubling of the grant price of the Company’s common stock as of the close of business during any five consecutive trading days
Total fair value of vested restricted stock	$ 0.2
Expected future pre-tax compensation expense, nonvested restricted shares	$ 34.7
Nonvested restricted stock outstanding	783,000	561,000
Awards granted, shares	240,000
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	Restricted stock granted to non-employee directors generally vests two years after the grant date (cliff vesting) and is subject to accelerated vesting due to certain events, including doubling of the grant price of the Company’s common stock as of the close of business during any five consecutive trading days.
Performance Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	266,000
Performance Restricted Stock Units [Member] | Officers And Key Management Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted, shares	119,000
Non vested Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock options outstanding	3,000,000.0
Maximum [Member] | Performance Restricted Stock Units [Member] | Officers And Key Management Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting rate	200.00%
Minimum [Member] | Performance Restricted Stock Units [Member] | Officers And Key Management Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting rate	0.00%

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