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Net Income Per Share - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income Per Share [Line Items]
Dilutive shares		148,000	371,000	55,000
Anti-dilutive options	432
Anti-dilutive securities excluded from computation of earnings per share minimum price range		$ 8.54		$ 8.54
Anti-dilutive securities excluded from computation of earnings per share maximum price range		$ 14.13		$ 14.13
Equity Option [Member]
Net Income Per Share [Line Items]
Anti-dilutive options	0	1,390,000	0	1,390,000

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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