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Net Income per Weighted-Average Common Share - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share Disclosure [Line Items]
Stock options to purchase common stock	1,469,890	2,012,378
Shares excluded from the computation of the diluted net income per weighted-average common share	148,426	1,295,172

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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