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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share Disclosure [Line Items]      
Net income - Basic and Diluted $ 12,278 $ 1,544 $ 9,281
Weighted-average shares outstanding - Basic 13,850 13,519 12,757
Effect of dilutive securities:      
Stock options and restricted stock 416 455 286
Weighted-average shares outstanding - Diluted 14,266 13,974 13,043
Basic income per common share $ 0.89 $ 0.11 $ 0.73
Diluted income per common share $ 0.86 $ 0.11 $ 0.71