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Calculations of Basic and Diluted Income per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share Disclosure [Line Items]      
Net income - Basic and Diluted $ 15,720 $ 12,278 $ 1,544
Weighted-average shares outstanding - Basic 14,174 13,850 13,519
Effect of dilutive securities:      
Stock options and restricted stock 375 416 455
Weighted-average shares outstanding - Diluted 14,549 14,266 13,974
Basic income per common share $ 1.11 $ 0.89 $ 0.11
Diluted income per common share $ 1.08 $ 0.86 $ 0.11