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Net Income Per share - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Dilutive shares	148	106	55	106
Anti-dilutive option excluded from dilutive shares outstanding	1,297	1,290	1,390	1,290
Anti-dilutive securities excluded from computation of earnings per share minimum price range	$ 8.54	$ 8.86	$ 8.54	$ 8.86
Anti-dilutive securities excluded from computation of earnings per share maximum price range one	$ 14.13	$ 14.13	$ 14.13	$ 14.13

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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