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Net Income Per Common Share (Parenthetical) (Detail) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2010 Convertible Notes | Dec. 31, 2012 Convertible Notes | Dec. 31, 2011 Convertible Notes | Dec. 31, 2010 Convertible Notes Hedge Warrant | Dec. 31, 2012 Convertible Notes Hedge Warrant | Dec. 31, 2011 Convertible Notes Hedge Warrant | Mar. 31, 2009 Convertible Notes Hedge Warrant
Net Income Loss Per Common Share |  |  |  |  |  |  |  |
Initial debt conversion price | $ 5.48 |  | $ 5.48 | $ 5.48 | $ 7.67 | $ 7.67 | $ 7.67 | $ 7.67
Shares that would be issued upon conversion | 34,703,196 | 34,700,000 |  |  | 34,700,000 |  |  |

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- Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 32 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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