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Net Income (Loss) Per Share - Schedule of Outstanding Securities (Detail)	9 Months Ended
	Sep. 30, 2012
Outstanding Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding securities having potential to dilute basic EPS	3,099,155
Unvested Restricted Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding securities having potential to dilute basic EPS	44,000
Unvested RSUs [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding securities having potential to dilute basic EPS	676,755

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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