Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
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	3,700,000
Estimated pretax compensation expense	$ 12.0
Estimated pretax compensation expenses expiration, years	Four
Volatility assumptions for estimating the fair value of stock options minimum	58.80%
Volatility assumptions for estimating the fair value of stock options maximum	90.60%
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
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
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%
Vesting period in years	3 years
Performance Based Restricted Stock [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period in years	3 years
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	10,100,000
Outstanding, Restricted stock units	1,400,000

Common stock available for future share-based awards.

No definition available.

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- 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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- 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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- Definition

The yearly percentage that vests for employee stock option grants.

+ References

No definition available.

+ Details

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- 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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- Definition

The future estimated share-based compensation expense to be recognized for all unvested share-based awards that have been granted to participants, including both stock options and shares of restricted stock.

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No definition available.

+ Details

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- 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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- 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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- Definition

The yearly percentage that vests for restricted stock awards.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Non Employee Director Expiration Period

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No definition available.

+ Details

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- Details

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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

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

+ Details

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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

+ Details

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

+ Details

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- Definition

The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

+ Details

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