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Commitments and Contingencies (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Nov. 15, 2010
Nov. 15, 2010
Maximum [Member]
Nov. 15, 2010
Minimum [Member]
Sep. 30, 2012
Illinois [Member]
Dec. 31, 2011
Illinois [Member]
Sep. 30, 2012
Puerto Rico [Member]
Sep. 30, 2012
Location 1 [Member]
Minimum [Member]
Sep. 30, 2012
Location 2 [Member]
Minimum [Member]
Sep. 30, 2012
Wind Storms [Member]
Sep. 30, 2012
Wind Storms [Member]
Maximum [Member]
Sep. 30, 2012
Wind Storms [Member]
Minimum [Member]
Sep. 30, 2012
Earthquake [Member]
Sep. 30, 2012
Earthquake [Member]
United States [Member]
Sep. 30, 2012
Earthquake [Member]
United States [Member]
Maximum [Member]
Sep. 30, 2012
Earthquake [Member]
United States [Member]
Minimum [Member]
Sep. 30, 2012
Flood [Member]
Location 1 [Member]
Maximum [Member]
Sep. 30, 2012
Flood [Member]
Location 2 [Member]
Maximum [Member]
Sep. 30, 2012
Self Insurance Programs [Member]
Sep. 30, 2012
Other debt and public utility guarantees [Member]
Nov. 15, 2010
Subsidiaries [Member]
Maximum [Member]
Jan. 01, 2008
Subsidiaries [Member]
Maximum [Member]
Jan. 01, 2008
Subsidiaries [Member]
Minimum [Member]
Sep. 30, 2012
Psychiatric Solutions Inc [Member]
Maximum [Member]
Sep. 30, 2012
Psychiatric Solutions Inc [Member]
Minimum [Member]
Nov. 14, 2010
Psychiatric Solutions Inc [Member]
Minimum [Member]
Nov. 15, 2010
Legacy Subsidiaries [Member]
Maximum [Member]
Commitments and Contingencies (Textual) [Abstract]                                                        
Self-insured for professional and general liability $ 300,000,000 $ 292,000,000                                           $ 10,000,000 $ 75,000,000 $ 3,000,000 $ 3,000,000 $ 10,000,000
Purchased several excess policies through commercial insurance carriers per occurrence                                           200,000,000 200,000,000          
Percentage of liability for claims paid under commercially insured coverage     10.00%                                                  
Liability for claims paid under commercially insured coverage       60,000,000 10,000,000                                              
Self-insured for professional and general liability, current 60,000,000 60,000,000                                                    
Commercial property insurance policies covering catastrophic losses               25,000,000       1,000,000,000   250,000,000 100,000,000                          
Maximum insurance deductible                     250,000             250,000 500,000                  
Minimum Insurance Deductible                 50,000 250,000                                    
Percentage of insurance deductible                       5.00% 3.00%     5.00% 1.00%                      
Accounts receivable, net 1,042,535,000 969,802,000       76,000,000 54,000,000                                          
Accounts receivable net greater than sixty days Past due 55,000,000 41,000,000                                                    
Off-balance sheet contingent obligation $ 81,000,000                                     $ 66,000,000 $ 15,000,000