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Calculations of Basic and Diluted Income per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share Disclosure [Line Items]        
Net income - basic and diluted $ 6,452 $ 5,104 $ 973 $ 1,272
Weighted-average shares outstanding - basic 14,266 13,912 14,129 13,824
Effect of dilutive securities:        
Stock options and restricted stock 365 395 365 418
Weighted-average shares outstanding - diluted 14,631 14,307 14,494 14,242
Basic income per common share $ 0.45 $ 0.37 $ 0.07 $ 0.09
Diluted income per common share $ 0.44 $ 0.36 $ 0.07 $ 0.09