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Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of shares to reduce shares available to grant by upon vesting of restricted stock units	4,200,000
Estimated pretax compensation expense	$ 10.0
Estimated pretax compensation expenses expiration, years	4 years
Service period in years	4 years
Long-term incentive, cash-based awards	3 years
Restricted stock awards exercisable in percentage	25.00%
Plan with a grant date fair value	6.7
Compensation-Stock Compensation and recognized a liability	0.1
Grant date fair value of the performance unit awards granted during the first quarter	5.0
Fair value of the liability incurred through	$ 0.1
Employee Stock Option [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Employee stock options exercisable in percentage	25.00%
Service period in years	4 years
Expiration period in years	10 years
Non-Employee Directors' Stock Options [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Expiration period in years	10 years
Non-Employee Directors' Stock Options [Member] | Scenario One [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period in years	3
Non-Employee Directors' Stock Options [Member] | Scenario Two [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period in years	4
2008 Incentive Compensation Plan [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Common stock subject to awards of stock options or stock appreciation rights payable in shares	1.0
Common stock subject to any other form of award	1.67
Common stock available for future share-based awards	10,200,000
Outstanding, Restricted stock units	2,500,000
Restricted Stock Shares [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Service period in years	4 years
Restricted stock awards exercisable in percentage	25.00%
Long-term incentive, cash-based awards	3 years

X

- Definition

Common stock subject to awards of restricted stock, restricted stock units, deferred stock, performance units, annual incentive awards and substitute awards, payable in shares.

+ References

No definition available.

+ Details

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X

- Definition

Common stock subject to awards of stock options or stock appreciation rights payable in shares.

+ References

No definition available.

+ Details

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X

- Definition

The yearly percentage that vests for employee stock option grants.

+ References

No definition available.

+ Details

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X

- Definition

The number of years over which estimated share-based compensation expense for all unvested share-based awards that have been granted to participants will be recognized.

+ References

No definition available.

+ Details

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X

- Definition

The number of restricted stock units awarded under the 2008 Incentive Compensation Plan during the period.

+ References

No definition available.

+ Details

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X

- Definition

Number of shares outstanding which will reduce shares available to grant upon vesting of restricted stock units and the exercise of stock options.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of liability incurred during period on performance unit awards to be settled in cash.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of liability incurred during period on restricted stock units to be settled in cash.

+ References

No definition available.

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X

- Definition

The fair value on grant date of performance unit awards to be settled in cash.

+ References

No definition available.

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X

- Definition

The yearly percentage that vests for restricted stock awards.

+ References

No definition available.

+ Details

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X

- Definition

The yearly percentage that vests for restricted stock units settled in cash.

+ References

No definition available.

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X

- Definition

The fair value on grant date of restricted stock units to be settled in cash.

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Periods

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Expiration Period

+ References

No definition available.

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X

- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ 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 (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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X

- 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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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.

+ 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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