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Earnings per Common Share - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Options and warrants not included in the computation of diluted earnings per common share	6,216,978	3,047,964

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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