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Calculations of Basic and Diluted Income Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share Disclosure [Line Items]      
Net income - Basic and Diluted $ 9,281 $ 20,947 $ 14,066
Weighted-average shares outstanding - Basic 12,757 12,511 12,128
Effect of dilutive securities:      
Stock options 286 299 401
Weighted-average shares outstanding - Diluted 13,043 12,810 12,529
Basic income per common share $ 0.73 $ 1.67 $ 1.16
Diluted income per common share $ 0.71 $ 1.64 $ 1.12