Share-Based Compensation Arrangement By Share-Based Payment Award, Performance Adjustment Percent

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Performance Measurement Period

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Performance Payout Percent

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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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- Definition

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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Share-based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	$ 3.9	$ 3.6	$ 7.2	$ 7.1
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum unrecognized cost for stocks and RSU's	$ 27.5		$ 27.5
Unrecognized compensation cost, weighted average period of recognition (in years)			2 years 1 month 6 days
Time Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 years
Awards with Performance Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance adjustment percent			25.00%
Awards with Performance Conditions \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance payout percent			0.00%
Awards with Performance Conditions \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance payout percent			200.00%
Awards with Performance Conditions \| 2018 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			3 years
Performance measurement period (in years)			1 year
Requisite service period (in years)			2 years