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Earnings per Share (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator:      
Income from continuing operations $ 19,567,000 $ 21,029,000 $ 27,135,000
Income (loss) from discontinued operations 491,000 (7,848,000) (3,166,000)
Net income $ 20,058,000 $ 13,181,000 $ 23,969,000
Denominator:      
Weighted average shares of common stock outstanding 11,959,252 12,670,387 13,774,083
Effect of dilutive common stock equivalents 111,478 107,890 43,610
Weighted average shares of common stock outstanding 12,070,730 12,778,277 13,817,693
Basic earnings per share      
Earnings per share from continuing operations $ 1.64 $ 1.66 $ 1.97
Earnings (loss) per share from discontinued operations 0.04 (0.62) (0.23)
Earnings per share 1.68 1.04 1.74
Diluted earnings per share      
Earnings per share from continuing operations 1.62 1.65 1.96
Earnings (loss) per share from discontinued operations 0.04 (0.62) (0.23)
Earnings per share $ 1.66 $ 1.03 $ 1.73