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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Numerator:          
Net income $ 6,476 $ 6,507 $ 17,564 $ 15,998 $ 23,365
Denominator:          
Weighted average shares outstanding for basic earnings per share 11,384 12,881 11,963 12,835  
Effect of dilutive securities 280 230 231 228  
Weighted average shares adjusted for dilutive securities 11,664 13,111 12,194 13,063  
Basic $ 0.57 $ 0.51 $ 1.47 $ 1.25  
Diluted $ 0.56 $ 0.50 $ 1.44 $ 1.22