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Earnings Per Share - Additional Information (Detail)	12 Months Ended
	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

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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