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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings attributable to common shareholders:        
From continuing operations $ 4,659 $ 4,622 $ 13,589 $ 13,982
From discontinued operations (4,432) (59) (4,727) (92)
Net income attributable to common shareholders $ 227 $ 4,563 $ 8,862 $ 13,890
Basic earnings per share attributable to common shareholders:        
From continuing operations $ 0.38 $ 0.39 $ 1.13 $ 1.19
From discontinued operations $ (0.36) $ 0.00 $ (0.39) $ (0.01)
Basic $ 0.02 $ 0.39 $ 0.74 $ 1.18
Diluted earnings per share attributable to common shareholders:        
From continuing operations $ 0.38 $ 0.38 $ 1.12 $ 1.18
From discontinued operations $ (0.36) $ 0.00 $ (0.39) $ (0.01)
Diluted $ 0.02 $ 0.38 $ 0.73 $ 1.17
Shares used in computation:        
Basic earnings per share - weighted-average shares 12,106 11,827 12,050 11,778
Effect of dilutive securities - Stock options 14 101 19 114
Denominator for diluted earnings per share - adjusted weighted-average shares 12,120 11,928 12,069 11,892