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5. INVESTMENT IN JOINT VENTURES (Tables)
 3 Months Ended
Mar. 31, 2013
Investment In Joint Ventures  
Key financial data in joint ventures
Balance Sheet Data:   March 31, 2013      
Current assets  $15,277      
Noncurrent assets   44,169      
Current liabilities   (5,537)     
Noncurrent liabilities   (5,871)     
Total net assets  $48,038      
           
Book value of Radnet joint venture interests  $22,422      
Cost in excess of book value of acquired joint venture interests   5,232      
Elimination of intercompany profit remaining on Radnet's consolidated balance sheet   305      
Total value of Radnet joint venture interests  $27,959      
           
Total book value of other joint venture partner interests  $25,616      
           
Income Statement Data for the three months ended March 31,   2013    2012 
           
Net revenue  $22,281   $21,076 
Net income  $2,733   $2,533