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Net Income Per share - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Dilutive shares 306 107
Anti-dilutive options 986 1,425
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 one $ 19.63 $ 14.13