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Earnings Per Share - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Options to purchase shares, common stock warrants and contingently issuable shares excluded from diluted earnings per share computation | 1,700,000 | 3,300,000 | 5,400,000
Common stock outstanding | 39,447,773 | 33,643,089 |

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