Number of active stock based compensation plans.

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Number of terminated or expired stock based compensation plans.

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Share based compensation arrangement by share based payment award award cliff vesting period.

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Share based compensation arrangement by share based payment award equity instruments other than options amount payable as percentage of initial award contingent upon maximum performance.

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- Definition

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

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

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock and Incentive Programs for Employees and Directors - Narrative (Detail)	12 Months Ended
	Dec. 31, 2020 USD ($) CompensationPlan shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 8,100,000	$ 10,900,000	$ 8,600,000
Share-based compensation expense, income tax benefit	2,100,000	2,800,000	2,200,000
Unrecognized share-based compensation cost	$ 4,700,000
Unrecognized compensation expense, weighted-average period of recognition	1 year 4 months 24 days
Number of active Share-based compensation plan \| CompensationPlan	1
Number of terminated or expired share-based compensation plans \| CompensationPlan	1
Continuing Operations
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 8,100,000	$ 10,900,000	$ 8,600,000
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting term	3 years
Cliff vesting period	3 years
Restricted Stock \| After January Two Thousand Nine
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting term	3 years
Restricted Stock \| Between January 2008 And January 2009
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting term	3 years
Restricted Stock \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting term	3 years
Award term (in years)	10 years
Stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting term	3 years
Unrecognized share-based compensation cost	$ 0
Stock options \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting term	4 years
Award term (in years)	10 years
Stock options \| Maximum \| After Retirement Date
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award term (in years)	5 years
Performance share units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting term	3 years
Unrecognized share-based compensation cost	$ 2,400,000
Unrecognized compensation expense, weighted-average period of recognition	1 year 4 months 24 days
Stock Compensation Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved and authorized (in shares) \| shares	7,300,000
Shares authorized and available for grant under the 2017 PIP \| shares	1,700,000
Performance Share Unit Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting term	3 years
Performance Share Unit Awards \| 2019 Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Amount payable as a percentage of initial award, contingent upon maximum performance	150.00%
Performance Share Unit Awards \| 2018 Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Amount payable as a percentage of initial award, contingent upon maximum performance	150.00%
Performance Share Unit Awards \| 2017 Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Amount payable as a percentage of initial award, contingent upon maximum performance	150.00%
Phantom Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting term	3 years
Unrecognized share-based compensation cost	$ 6,200,000
Unrecognized compensation expense, weighted-average period of recognition	1 year 10 months 24 days