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Share-based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified |
12 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Apr. 06, 2010
|
Dec. 31, 2012
Chief Executive Officer [Member]
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Dec. 31, 2013
Restricted Stock [Member]
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Dec. 31, 2012
Restricted Stock [Member]
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Dec. 31, 2010
Restricted Stock [Member]
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Dec. 31, 2011
Restricted Stock [Member]
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Dec. 31, 2013
Stock Options [Member]
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Dec. 31, 2012
Stock Options [Member]
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Dec. 31, 2013
Stock Options [Member]
Chief Executive Officer [Member]
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Dec. 31, 2012
Stock Options [Member]
Chief Executive Officer [Member]
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Dec. 31, 2013
Inducement Stock Options [Member]
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Dec. 31, 2012
Minimum [Member]
Restricted Stock [Member]
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Dec. 31, 2012
Maximum [Member]
Restricted Stock [Member]
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Dec. 31, 2013
2007 Stock Incentive Plan [Member]
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May 27, 2011
2007 Stock Incentive Plan [Member]
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Dec. 31, 2007
2007 Stock Incentive Plan [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||
| Issuance of shares of common stock | 2,000,000 | |||||||||||||||||
| Additional share issued under stock incentive plan | 3,000,000 | |||||||||||||||||
| Availability of common shares | 200,000 | |||||||||||||||||
| Number of shares, Granted | 212,000 | 343,000 | 3,400,000 | |||||||||||||||
| Shares vested immediately | 0 | 100,000 | 1,400,000 | |||||||||||||||
| Vesting period | 3 years | 4 years | ||||||||||||||||
| Number of common shares for vest immediately as condition of settlement agreement | 500,000 | |||||||||||||||||
| Remaining number of common shares for vest | 2,000,000 | |||||||||||||||||
| Pre-tax total unrecognized compensation cost related to non-vested restricted shares | $ 0.3 | $ 0.5 | $ 6.6 | |||||||||||||||
| Period of recognize the cost | 2017 | |||||||||||||||||
| Unrecognized compensation expense | 6.0 | 6.0 | ||||||||||||||||
| Previously recognized stock compensation expense | $ 1.3 | |||||||||||||||||
| Shares forfeited as a condition of settlement | 2,000,000 | 103,000 | 2,172,000 | |||||||||||||||
| Stock options granted | 245,000 | 1,375,000 | 100,000 | 1,200,000 | 800,000 | |||||||||||||