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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 10

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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- Definition

Weighted average price of options that were either forfeited or expired.

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- Definition

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

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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No definition available.

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Number of share options (or share units) exercised during the current period.

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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 210.5-02.28,29)

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Stock Plans - Share Based Compensation Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Method Used [Line Items]
Outstanding Balance, Shares	3,088,519
Stock options granted	168,916
Exercised, Shares	(1,687,918)
Canceled, Shares	(393,871)
Outstanding Balance, Shares	1,175,646
Exercisable Balance, Shares	764,693
Outstanding Balance, Weighted Average Exercise Price	$ 22.90
Granted, Weighted Average Exercise Price	$ 24.40
Exercised, Weighted Average Exercise Price	$ 19.97
Canceled, Weighted Average Exercise Price	$ 26.74
Outstanding Balance, Weighted Average Exercise Price	$ 26.02
Exercisable Balance, Weighted Average Exercise Price	$ 28.52
Equity incentive plan restricted stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Method Used [Line Items]
Nonvested shares balance, Shares	633,647
Granted, Shares	506,470
Vested, Shares	(214,598)
Canceled, Shares	(350,586)
Nonvested shares balance, Shares	574,933	633,647
Nonvested shares balance, Weighted Average Grant-Date Fair-Value	$ 25.15
Granted, Weighted Average Grant-Date Fair-Value	$ 33.57	$ 33.26	$ 21.97
Vested, Weighted Average Grant-Date Fair-Value	$ 20.80
Canceled, Weighted Average Grant-Date Fair-Value	$ 29.28
Nonvested shares balance, Weighted Average Grant-Date Fair-Value	$ 31.49	$ 25.15
Long Term Incentive Plan Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Method Used [Line Items]
Nonvested shares balance, Shares	281,500
Granted, Shares	11,182
Vested, Shares	(273,307)
Canceled, Shares	(19,375)
Nonvested shares balance, Shares
Nonvested shares balance, Weighted Average Grant-Date Fair-Value	$ 30.48
Granted, Weighted Average Grant-Date Fair-Value
Vested, Weighted Average Grant-Date Fair-Value	$ 30.48
Canceled, Weighted Average Grant-Date Fair-Value	$ 30.48
Nonvested shares balance, Weighted Average Grant-Date Fair-Value