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Acquisitions of Businesses and Non-Controlling Interests - Unaudited Proforma Net Revenue and Net Income from Continuing Operations (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Business Combinations [Abstract]    
Net revenues $ 275,511 $ 261,231
Net income attributable to common shareholders from continuing operations $ 19,231 $ 19,894
Earnings per share:    
Basic - net income attributable to common shareholders from continuing operations $ 1.60 $ 1.69
Diluted - net income attributable to common shareholders from continuing operations $ 1.59 $ 1.67
Shares used in computation:    
Basic - net income attributable to common shareholders from continuing operations 12,050 11,804
Diluted - net income attributable to common shareholders from continuing operations 12,069 11,904