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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Numerator:          
Net income $ 6,507 $ 1,397 $ 15,998 $ 11,421 $ 14,802
Denominator:          
Weighted average shares outstanding for basic earnings per share 12,881 12,714 12,835 12,687  
Effect of dilutive securities 230 220 228 263  
Weighted average shares adjusted for dilutive securities 13,111 12,934 13,063 12,950  
Basic $ 0.51 $ 0.11 $ 1.25 $ 0.90  
Diluted $ 0.50 $ 0.11 $ 1.22 $ 0.88