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Earnings per Share (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income $ 7,073,000 $ 2,813,000 $ 13,006,000 $ 6,804,000
Denominator:        
Weighted average shares of common stock outstanding 13,863,043 13,747,000 13,836,087 13,711,961
Effect of dilutive common stock equivalents $ 100,014 $ 87,264 $ 159,084 $ 67,634
Weighted average diluted common shares outstanding 13,963,057 13,834,264 13,995,171 13,779,595
EPS:        
Basic $ 0.51 $ 0.20 $ 0.94 $ 0.50
Diluted $ 0.51 $ 0.20 $ 0.93 $ 0.49