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5. INVESTMENT IN JOINT VENTURES (Tables)
 6 Months Ended
Jun. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]  
Roll forward of investment in joint ventures
Balance as of December 31, 2012  $28,598 
Acquisition of a controlling interest in a joint venture (see Note 2)   (648)
Purchase of a 40% interest in a new joint venture (see Note 2)   1,000 
Equity contributions in existing joint ventures   803 
Equity earnings in these joint ventures   2,864 
Distribution of earnings   (3,971)
Balance as of June 30, 2013  $28,646 
Key financial data in joint ventures
Balance Sheet Data:  June 30, 2013     
Current assets  $14,802      
Noncurrent assets   49,216      
Current liabilities   (6,995)     
Noncurrent liabilities   (6,286)     
Total net assets  $50,737      
           
Book value of Radnet joint venture interests  $22,880      
Cost in excess of book value of acquired joint venture interests   5,273      
Elimination of intercompany profit remaining on Radnet's consolidated balance sheet   493      
Total value of Radnet joint venture interests  $28,646      
           
Total book value of other joint venture partner interests  $27,857      
           
Income Statement Data for the six months ended June 30,   2013    2012 
           
Net revenue  $45,209   $41,955 
Net income  $5,952   $7,016