The estimated forfeiture rate used to reduce total share based compensation expense recognized during the period.

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Share-based Compensation Arrangement by Share-based Payment Award, Accrued Incremental Dividend Equivalent Rights on shares underlying restricted stock units granted under the 2004 Incentive Plan and the 2013 Directors Plan.

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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

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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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Amount of tax benefit for recognition of expense of award 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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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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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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The number of grants made 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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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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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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The highest quantity of shares an employee can purchase under the plan per period.

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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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Net number of share options (or share units) granted during the period.

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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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Amount of noncash expense for option under share-based payment arrangement.

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Share-Based Employee Compensation - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020 USD ($) plan $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans \| plan	2
Authorized (in shares) \| shares	34,000,000
Accrued incremental dividend equivalent rights (in shares) \| shares	3,064,000
Compensation expense related to stock options \| $	$ 0	$ 14,000
Share based compensation, weighted average estimated forfeiture rate		1.70%
Number of shares granted (in shares) \| shares	0	0	0
Total intrinsic value for options exercised \| $	$ 566,000	$ 792,000	$ 2,621,000
Exercise of stock options \| $	248,000	368,000	1,636,000
Compensation expense related to restricted stock \| $	6,417,000	6,098,000	5,949,000
Stock compensation - expensed (reversed) \| $	10,927,000	12,896,000	13,530,000
Granted, number of units \| $	$ 2,513,000	$ 2,966,000	$ 3,112,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued incremental dividend equivalent rights (in shares) \| shares	3,000
Total unrecognized compensation expense related to non-vested shares granted \| $	$ 6,968,000
Unrecognized compensation expense expected recognition period	1 year 6 months
Weighted average grant date fair value per share of PSUs granted (in dollars per unit) \| $ / shares	$ 17.84	$ 15.63	$ 15.30
Number of units granted (in units) \| shares	409,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Expiration period	10 years
Total unrecognized compensation expense related to non-vested shares granted \| $	$ 0
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense related to non-vested shares granted \| $	$ 3,527,000
Unrecognized compensation expense expected recognition period	1 year 1 month 6 days
Weighted average grant date fair value per share of PSUs granted (in dollars per unit) \| $ / shares	$ 19.66	$ 15.17	$ 14.80
Award requisite service period	3 years		1 year
Shares awarded as a percentage of granted	100.00%			200.00%
Number of units granted (in units) \| shares	125,000	226,000	307,000
Stock compensation - expensed (reversed) \| $	$ 4,511,000	$ 6,796,000	$ 7,567,000
Performance Share Units with Total Shareholder Return Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Minimum \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Minimum \| Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period	1 year
Shares awarded as a percentage of granted	0.00%
Maximum \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum \| Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period	3 years
Shares awarded as a percentage of granted	200.00%
2004 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares per employee \| shares	2,000,000
2004 Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized (in shares) \| shares	33,000,000
2013 Directors Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares per employee \| shares	50,000
2013 Directors Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized (in shares) \| shares	1,000,000