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Stock Compensation - Stock Options Granted Pursuant to Equity Incentive Plans (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items] | |||
| Outstanding, Shares, Beginning of Period | 206,400 | 451,308 | 1,505,694 |
| Granted, shares | 0 | 0 | 0 |
| Exercised, Shares | (149,489) | (137,197) | (1,030,516) |
| Cancelled, Shares | (4,215) | (107,711) | (23,870) |
| Outstanding, Shares, End of Period | 52,696 | 206,400 | 451,308 |
| Outstanding, Weighted average option exercise price, Beginning of Period | $ 7.62 | $ 11.26 | $ 12.01 |
| Granted, Weighted average option exercise price | $ 0 | $ 0 | $ 0 |
| Exercised, Weighted average option exercise price | $ 7.03 | $ 9.46 | $ 12.53 |
| Cancelled, Weighted average option exercise price | $ 6.95 | $ 20.55 | $ 4.10 |
| Outstanding, Weighted average option exercise price, End of Period | $ 9.34 | $ 7.62 | $ 11.26 |
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- Definition
Share Based Compensation arrangement by share based payment award options exercised in period Weighted Average Exercise Price. No definition available.
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- Definition
Share based compensation arrangement by share based payments award options forfeitures in period weighted average exercise price. No definition available.
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- Details
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- Definition
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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded. No definition available.
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- Definition
The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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