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1. NATURE OF BUSINESS AND BASIS OF PRESENTATION (Tables)
 6 Months Ended
Jun. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Service fee revenue
   Three Months Ended   Six Months Ended 
   June 30,   June 30, 
   2013   2012   2013   2012 
                 
Commercial Insurance/Managed Care Capitation  $122,693   $115,332   $243,043   $228,788 
Medicare   36,815    34,500    72,591    68,107 
Medicaid   6,285    5,833    11,997    11,572 
Workers Compensation/Personal Injury   8,802    7,500    18,307    14,878 
Other   8,880    8,581    17,299    16,901 
Service fee revenue, net of contractual allowances and discounts   183,475    171,746   363,237    340,246 
                     
Provision for bad debts   (6,955)   (6,395)   (13,777)   (12,879)
Net service fee revenue  $176,520   $165,351   $349,460   $327,367