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Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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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

X
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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. + References 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 + References 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 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 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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