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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
Mar. 31, 2014
Mar. 31, 2013
Earnings attributable to common shareholders:    
From continuing operations $ 4,228 $ 3,851
From discontinued operations   (130)
Net income attributable to common shareholders 4,228 3,721
Revaluation of redeemable non-controlling interests, net of tax (967)  
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest, Total $ 3,261 $ 3,721
Basic earnings per share attributable to common shareholders:    
From continuing operations $ 0.35 $ 0.32
From discontinued operations   $ (0.01)
Income (loss) from operations before, per basic share $ 0.35 $ 0.31
Charges to additional-paid-in-capital - revaluation of redeemable non-controlling interests, net of tax $ (0.08)  
Basic $ 0.27 $ 0.31
Diluted earnings per share attributable to common shareholders:    
From continuing operations $ 0.35 $ 0.32
From discontinued operations   $ (0.01)
Income (loss) from operations before, per diluted share $ 0.35 $ 0.31
Charges to additional-paid-in-capital - revaluation of redeemable non-controlling interests, net of tax $ (0.08)  
Diluted $ 0.27 $ 0.31
Shares used in computation:    
Basic earnings per share - weighted-average shares 12,129 11,955
Effect of dilutive securities - stock options 15 24
Denominator for diluted earnings per share - adjusted weighted-average shares 12,144 11,979