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Acquisition of Businesses - Schedule of Preliminary Purchase Price Allocation (Detail) (USD $)
 1 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2013
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
May 22, 2012
Business Combinations [Abstract]          
Cash paid, net of cash acquired $ 9,998,000 $ 9,998,000 $ 7,180,000 $ 7,929,000  
Seller notes 800,000     350,000 250,000
Total consideration 10,798,000     8,279,000  
Estimated fair value of net tangible assets acquired:          
Total current assets 1,349,000     363,000  
Total non-current assets 719,000     478,000  
Total liabilities (242,000)     (290,000)  
Net tangible assets acquired 1,826,000     551,000  
Tradenames   1,300,000   1,300,000  
Referral relationships   800,000   857,000  
Non competition agreements       265,000  
Goodwill 14,400,000     8,198,000  
Fair value of noncontrolling interest (5,428,000)     (2,892,000)  
Total consideration $ 10,798,000     $ 8,279,000