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Acquisitions of Businesses and Non-Controlling Interests - Schedule of Preliminary Purchase Price Allocation (Detail) (USD $)
 1 Months Ended 12 Months Ended
Jul. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 13, 2013
May 31, 2012
May 22, 2012
Business Combinations [Abstract]              
Cash paid, net of cash acquired $ 7,930,000 $ 46,628,000 $ 7,929,000 $ 9,451,000      
Seller notes 200,000 1,300,000 350,000   500,000 100,000 250,000
Total consideration 8,130,000 47,928,000 8,279,000        
Estimated fair value of net tangible assets acquired:              
Total current assets 1,341,000 3,895,000 410,000        
Total non-current assets 902,000 2,283,000 525,000        
Total liabilities (581,000) (1,082,000) (333,000)        
Net tangible assets acquired 1,662,000 5,096,000 602,000        
Referral relationships 1,100,000 400,000 857,000        
Non compete 300,000 160,000 265,000        
Tradename 1,900,000 600,000 1,300,000        
Goodwill 11,263,000 52,213,000 8,147,000        
Fair value of noncontrolling interest (8,095,000) (10,541,000) (2,892,000)        
Total consideration $ 8,130,000 $ 47,928,000 $ 8,279,000