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Reconciliation of Basic and Diluted Shares Amounts (Detail) - USD ($)
$ / shares in Units, $ 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 $ 265 $ 2,538 $ 3,613 $ 2,929 $ (398) $ 1,466 $ 2,825 $ 4,277 $ 9,345 $ 8,170 $ 16,093
Denominator:                      
Basic weighted average common shares outstanding 32,946,000 32,925,000 32,870,000 32,755,000 32,747,000 32,677,000 32,234,000 31,963,000 32,881,940 32,497,657 31,667,015
Weighted average common stock equivalents from assumed exercise of stock options and restricted stock awards                 695,151 766,010 739,626
Diluted weighted average common shares outstanding 33,577,000 33,690,000 33,671,000 33,451,000 32,747,000 33,327,000 33,076,000 31,855,000 33,577,091 33,263,667 32,406,641
Basic net income per common share $ 0.01 $ 0.08 $ 0.11 $ 0.09 $ (0.01) $ 0.04 $ 0.09 $ 0.13 $ 0.28 $ 0.25 $ 0.51
Diluted net income per common share $ 0.01 $ 0.08 $ 0.11 $ 0.09 $ (0.01) $ 0.04 $ 0.09 $ 0.13 $ 0.28 $ 0.25 $ 0.50