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Earnings per Share - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Earnings Per Share [Line Items] |  |  |  |  |
Convertible preferred stock par value | $ 0.001 |  | $ 0.001 |  | $ 0.001
Assumed Average Market Price Per Share Exercise Of Warrants Treasury Method | $ 16.85 | $ 16.92 | $ 17.00 | $ 15.44 |
Series A Convertible Preferred Stock [Member] |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |
Convertible preferred stock par value | $ 0.001 |  | $ 0.001 |  |

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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition The assumed average market price per share used when calculating the dilutive impact on earnings per share using the Treasury method. + References No definition available. + Details
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- Details
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