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Earnings per Share (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator:        
Income from continuing operations $ 5,402,000 $ 5,281,000 $ 15,665,000 $ 18,445,000
Income (loss) from discontinued operations 104,000 (426,000) 533,000 (1,903,000)
Net income $ 5,506,000 $ 4,855,000 $ 16,198,000 $ 16,542,000
Denominator:        
Weighted average shares of common stock outstanding 11,922,690 12,457,438 12,028,205 12,877,297
Effect of dilutive common stock equivalents 97,156 111,949 93,580 98,374
Weighted average shares of common stock outstanding 12,019,846 12,569,387 12,121,785 12,975,671
Basic earnings per share        
Earnings per share from continuing operations $ 0.45 $ 0.42 $ 1.30 $ 1.43
Earnings (loss) per share from discontinued operations 0.01 (0.03) 0.05 (0.15)
Earnings per share 0.46 0.39 1.35 1.28
Diluted earnings per share        
Earnings per share from continuing operations 0.45 0.42 1.29 1.42
Earnings (loss) per share from discontinued operations 0.01 (0.03) 0.05 (0.15)
Earnings per share $ 0.46 $ 0.39 $ 1.34 $ 1.27