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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings attributable to common shareholders:                      
From continuing operations $ 3,903 $ 4,659 $ 5,079 $ 3,851 $ 4,230 $ 4,588 $ 4,958 $ 4,436 $ 17,492 $ 18,212 $ 18,812
From discontinued operations (42) (4,432) (165) (130) (187) (25) (109) 42 (4,769) (279) 2,162
Net income attributable to common shareholders $ 3,861 $ 227 $ 4,914 $ 3,721 $ 4,043 $ 4,563 $ 4,849 $ 4,478 $ 12,723 $ 17,933 $ 20,974
Basic earnings per share attributable to common shareholders:                      
From continuing operations $ 0.32 $ 0.38 $ 0.42 $ 0.32 $ 0.35 $ 0.39 $ 0.41 $ 0.37 $ 1.45 $ 1.54 $ 1.60
From discontinued operations   $ (0.36) $ (0.01) $ (0.01) $ (0.02)   $ (0.01)   $ (0.40) $ (0.02) $ 0.18
Basic $ 0.32 $ 0.02 $ 0.41 $ 0.31 $ 0.33 $ 0.39 $ 0.40 $ 0.37 $ 1.05 $ 1.52 $ 1.78
Diluted earnings per share attributable to common shareholders:                      
From continuing operations $ 0.32 $ 0.38 $ 0.42 $ 0.32 $ 0.35 $ 0.38 $ 0.41 $ 0.37 $ 1.45 $ 1.53 $ 1.57
From discontinued operations   $ (0.36) $ (0.01) $ (0.01) $ (0.02)   $ (0.01)   $ (0.40) $ (0.02) $ 0.18
Diluted $ 0.32 $ 0.02 $ 0.41 $ 0.31 $ 0.33 $ 0.38 $ 0.40 $ 0.37 $ 1.05 $ 1.51 $ 1.75
Shares used in computation:                      
Basic earnings per share - weighted-average shares 12,103 12,106 12,089 11,955 12,103 12,106 12,089 11,955 12,063 11,804 11,814
Effect of dilutive securities - Stock options                 19 100 163
Denominator for diluted earnings per share - adjusted weighted-average shares 12,117 12,120 12,110 11,979 12,117 12,120 12,110 11,979 12,082 11,904 11,977