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Contingencies (Details) (USD $)
3 Months Ended6 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2010
Jun. 30, 2010
Jun. 30, 2009
Sep. 30, 2011
Dec. 31, 2005
Dec. 31, 2004
Dec. 31, 1996
Dec. 31, 1995
Dec. 31, 2010
Jul. 30, 2010
Contingencies (Textual) [Abstract]          
Judgment Against Mr. Scrushy in Tucker Case  $ 2,900,000,000       
Damages Sought by Mr. Scrushy for Termination as CEO Pursuant to His Employment Agreement    in excess of $ 70 million     
Gain (Loss) Related to Litigation Settlement, Scrushy   10,600,000      
Percentage of any recovery obligated to the attorneys for the derivative shareholder plaintiffs   35.00%      
Percentage of any net recovery obligated to the federal plaintiffs under the Consolidated Securities Action settlement   25.00%      
Amount of assets distributed that were previously collected to attorneys for the derivative shareholder plaintiffs   4,400,000      
Term of contract between Horizon/CMS and General Medicine to provide medical director services       3  
Termination of Horizon/CMS and General Medicine Agreement, Tenure      6 months post to execution of the agreement   
Consent judgment in favor of General Medicine in Michigan Action     376,000,000    
Damages Awarded to Plaintiff in Sulton Case         12,300,000
Liability Recorded for Damages Awarded in Sulton Case   12,300,000    12,300,000 
Receivable Recorded for Sulton Case Award Covered by Insurance   7,700,000    7,700,000 
Net Charge Recorded for Damages Awarded in Sulton Case 4,600,000        
Portion of Sulton Case Award Covered by Company's Captive Insurance Subsidiary 4,600,000        
Deposit Paid to Court During Appeal Process of Sulton Case$ 6,000,000