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

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Shares Awarded As a Percentage of Granted

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

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.

+ References

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

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).

+ References

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- Definition

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).

+ References

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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.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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- Definition

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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- Definition

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

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- Definition

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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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Share-Based Employee Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) plan $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans \| plan	2
Authorized (in shares) \| shares	34,000,000
Compensation expense related to stock options	$ 34	$ 146	$ 1,396
Share based compensation, weighted average estimated forfeiture rate	1.70%	3.70%	6.20%
Number of shares granted (in shares) \| shares	0	0	0
Total intrinsic value for options exercised	$ 3,546	$ 1,005	$ 2,151
Exercise of stock options	5,362	2,637	6,565
Compensation expense related to restricted stock	5,537	4,283	3,539
Stock compensation - expensed (reversed)	12,615	9,285	$ 11,220
Accrued employee compensation and benefits	$ 40,173	$ 32,568
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued incremental dividend equivalent rights (in shares) \| shares	6,000
Total unrecognized compensation expense related to non-vested shares granted	$ 8,692
Unrecognized compensation expense expected recognition period	2 years 4 months 28 days
Weighted average grant date fair value per share of PSUs granted (in dollars per unit) \| $ / shares	$ 10.94	$ 9.36	$ 8.33
Number of units granted (in units) \| shares	680,000
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	$ 14
Unrecognized compensation expense expected recognition period	5 months 1 day
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Total unrecognized compensation expense related to non-vested shares granted	$ 9,083
Unrecognized compensation expense expected recognition period	1 year 2 months 1 day
Weighted average grant date fair value per share of PSUs granted (in dollars per unit) \| $ / shares	$ 10.68	$ 8.61	$ 7.96
Award requisite service period	3 years	1 year	1 year
Shares awarded as a percentage of granted			130.20%	131.50%
Number of units granted (in units) \| shares	462,000	420,000	510,000
Stock compensation - expensed (reversed)	$ 7,075	$ 4,536	$ 2,607
Phantom Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units granted (in units) \| shares	0	0	0
Stock compensation - expensed (reversed)			$ 390
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Weighted average grant date fair value per share of PSUs granted (in dollars per unit) \| $ / shares	$ 0.00
Number of units granted (in units) \| shares	0
Stock compensation - expensed (reversed)	$ (32)	$ 320	$ 3,288
Accrued employee compensation and benefits	$ 0	$ 224
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