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Earnings Per Share - Summary of Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator                      
Net Income $ 5,718 $ 7,067 $ 2,544 $ 3,317 $ 9,292 $ 11,326 $ 14,395 $ 9,607 $ 18,646 $ 44,620 $ 45,794
Denominator                      
Weighted average number of shares - basic                 51,145 55,120 59,001
Effect of dilutive securities:                      
Stock options                 81 304 390
Restricted stock and restricted stock units                 41 58 33
Weighted average number of shares - diluted                 51,267 55,482 59,424
Net income per share - basic $ 0.12 $ 0.14 $ 0.05 $ 0.06 $ 0.17 $ 0.21 $ 0.26 $ 0.17 $ 0.36 $ 0.81 $ 0.78
Net income per share - diluted $ 0.12 $ 0.14 $ 0.05 $ 0.06 $ 0.17 $ 0.21 $ 0.26 $ 0.17 $ 0.36 $ 0.80 $ 0.77