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Share-Based Compensation - Additional Information (Detail) - USD ($) shares in Thousands, $ in Millions		3 Months Ended	9 Months Ended
	Jan. 01, 2018	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of stock options exercised			$ 37.4
Total fair value of stock options vested			12.9
Expected future pre-tax compensation expense, nonvested stock options			$ 17.4
Weighted average period to recognize expected future pre-tax compensation expense (in years)			2 years
Nonvested restricted stock outstanding (in shares)			600
Share-based payment award, options, outstanding (in shares)			4,455	4,303
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of stock options			7 years
Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of stock options			10 years
Restricted Stock Granted Prior Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cliff vesting period			4 years
Non Employee Directors Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cliff vesting period			2 years
Restricted Stock
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			$ 13.8
Expected future pre-tax compensation expense, nonvested restricted shares			$ 24.6
Nonvested restricted stock outstanding (in shares)			576	561
Awards granted (in shares)			242
Restricted Stock | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting rate	33.33%
Restricted Stock | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting rate	33.33%
Restricted Stock | Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting rate	33.33%
Stock Option
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.
Stock Option | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting rate	33.33%		25.00%
Stock Option | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting rate	33.33%		25.00%
Stock Option | Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting rate	33.33%		25.00%
Stock Option | Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting rate			25.00%
Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, options, outstanding (in shares)			264
Performance Restricted Stock Units | Officers And Key Management Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cliff vesting period		3 years
Awards granted (in shares)		119
Non vested Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock options outstanding (in shares)			1,900
Maximum | Performance Restricted Stock Units | Officers And Key Management Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting rate		200.00%
Minimum | Performance Restricted Stock Units | Officers And Key Management Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting rate		0.00%

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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