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Earnings / (loss) per share - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012
Earnings Per Share [Line Items]
Stock options	650,000
Restricted stock	145,261
Warrants	6,713
Employee stock options	1,635,522

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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