Disposal Group, Including Discontinued Operations, Share-based Compensation Expense

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Expiry Period From Date Of Grant

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- Definition

Share Incentive Plans [Abstract]

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Conversion Rate Of Target

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- Definition

Spinoff Transaction, Equity Interests Issued Per Ordinary Predecessor Share

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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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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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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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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Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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Share Plans - Additional Information (Detail) - USD ($)	12 Months Ended
Share Plans - Additional Information (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based compensation expense
Share-based compensation			$ 3,400,000
Share Incentive Plans
Number of shares authorized for issuance	3,300,000
Vesting period	3 years
Fair value of options granted
Weighted average grant date fair value of options granted	$ 9.55	$ 8.86	$ 10.92
Total intrinsic value of options exercised	$ 18,000,000.0	$ 9,500,000	$ 18,200,000
Unrecognized compensation cost related to stock options	3,000,000.0
Cash received from option exercises	30,800,000	15,500,000	19,500,000
Tax benefit realized for tax deductions from option exercises	$ 2,900,000	2,800,000	5,600,000
Weighted average grant date fair value
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	2,500,000
Stock Options
Share Incentive Plans
Vesting period	3 years
Expiration period	10 years
Weighted average grant date fair value
Weighted average period to recognize compensation cost	1 year 9 months 18 days
Stock Options \| Tranche 1
Share Incentive Plans
Vesting percentage	33.33%
Stock Options \| Tranche 2
Share Incentive Plans
Vesting percentage	33.33%
Stock Options \| Tranche 3
Share Incentive Plans
Vesting percentage	33.33%
Restricted Stock And Restricted Stock Units (RSUs) [Member]
Share Incentive Plans
Vesting period	3 years
Restricted Stock And Restricted Stock Units (RSUs) [Member] \| Tranche 1
Share Incentive Plans
Vesting percentage	33.33%
Restricted Stock And Restricted Stock Units (RSUs) [Member] \| Tranche 2
Share Incentive Plans
Vesting percentage	33.33%
Restricted Stock And Restricted Stock Units (RSUs) [Member] \| Tranche 3
Share Incentive Plans
Vesting percentage	33.33%
Restricted Stock Units
Weighted average grant date fair value
Unrecognized compensation cost related to restricted stock units	$ 25,600,000
Weighted average period to recognize compensation cost	1 year 2 months 12 days
Total fair value of shares vested	$ 11,200,000	9,300,000	24,400,000
Tax benefit realized for tax deductions from option exercises	$ 0	100,000	700,000
Spin-off transaction, equity interests issued per ordinary predecessor share (in share)	1
Stock Appreciation Rights (SARs)
Share Incentive Plans
Vesting period	3 years
Performance Shares
Weighted average grant date fair value
Unrecognized compensation cost related to restricted stock units	$ 7,500,000
Weighted average period to recognize compensation cost	1 year 2 months 12 days
Tax benefit realized for tax deductions from option exercises	$ 100,000	$ 200,000	$ 200,000
Performance Shares \| Grant Date 2016
Weighted average grant date fair value
Conversion rate of target	125.00%
Performance Shares \| Grant Date 2017
Weighted average grant date fair value
Conversion rate of target	100.00%