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Net Income Per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
Net Income Per Share - Additional Information (Detail)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Stock options and restricted stock units outstanding	769,000	1,059,000	769,000	1,059,000
Number of shares excluded from computation of diluted earnings per share	64	104,000	534	101,000

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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