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Period of time after a director has left the Board that must elapse for director to receive shares of stock for vested deferred stock units.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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

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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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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Percentage of vesting of award under share-based payment arrangement.

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Equity-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized equity-based compensation expense			$ 5.5
Unrecognized equity compensation cost	$ 16.3
Unrecognized equity compensation cost, weighted-average period	1 year 1 month 6 days
Total fair value of shares vested during the period	$ 12.7	$ 9.7	12.1
Total intrinsic value of stock options exercised	$ 1.3	$ 2.4	$ 1.7
Weighted average grant-date fair value of stock options granted	$ 9.69
Vesting period	3 years
Vesting percentage	33.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	2 years
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Omnibus Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	15,000,000
Shares available for future issuance	7,680,000
2019 Long-Term Incentive Plan Below Threshold Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year	0.00%
2019 Long-Term Incentive Plan At or Above Maximum Performance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage, per year	100.00%
2019 Long-Term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period	3 years
Time Vesting and Performance Vesting Restricted Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value	$ 15.85	$ 26.55	$ 15.40
Long-Term Incentive Performance Restricted Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting terms	The performance-vesting restricted units granted in 2020 contain a performance period through calendar year 2022 (or, the end of the 2023 calendar year, as applicable), and are otherwise consistent with the terms of the modified 2019 LTIP Performance Awards as discussed further below. Equity compensation expense has not yet been recorded related to these awards.
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	50.00%
Number of restricted stock units approved to recognize employees for their contributions	1,200,000
Previous Long-Term Incentive Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting terms	The Company previously granted long-term incentive performance restricted units in 2019 (the “2019 LTIP Performance Awards”) which contained a three-year performance period consisting of the 2019-2021 calendar years (or, extended through the end of the 2022 calendar year, as applicable) and were eligible to vest based upon the Company’s achievement of specific performance goals for the performance period, as defined. The total number of 2019 LTIP Performance Awards eligible to vest will be based on the level of achievement of the performance goals and ranges from 0% (if below threshold performance) up to 100% (for target or above performance). Upon achievement of the performance goals, only 50% of the award for a given level of performance will vest, with the remaining 50% subject to a one-year performance test period. The goal achieved must be met again or exceeded the next fiscal year before the remaining units are earned.
Deferred Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock shares to be received for each deferred stock unit	1
Period of time after director has left the board to receive shares	3 months