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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share Disclosure [Line Items]        
Net income - basic and diluted $ 4,330 $ 6,452 $ 903 $ 973
Weighted-average shares outstanding - basic 14,572 14,266 14,422 14,129
Effect of dilutive securities:        
Stock options and other stock awards 471 365 478 365
Weighted-average shares outstanding - diluted 15,043 14,631 14,900 14,494
Basic income per common share $ 0.30 $ 0.45 $ 0.06 $ 0.07
Diluted income per common share $ 0.29 $ 0.44 $ 0.06 $ 0.07