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Earnings per Share (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator:      
Net income $ 23,969,000 $ 15,876,000 $ 18,541,000
Denominator:      
Weighted average shares of common stock outstanding 13,774,083 13,721,997 13,965,018
Effect of dilutive common stock equivalents 43,610 17,827 233,477
Weighted average diluted common shares outstanding 13,817,693 13,739,824 14,198,495
EPS:      
Basic $ 1.74 $ 1.16 $ 1.33
Diluted $ 1.73 $ 1.16 $ 1.31