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Segment Reporting (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Gross inpatient revenues $ 5,083,418 $ 4,693,693  
Gross outpatient revenues 1,848,225 1,721,793  
Total net revenues 1,831,632 1,793,036  
Income/(loss) before allocation of corporate overhead and income taxes 203,984 222,318  
Allocation of corporate overhead 0 0  
Income/(loss) after allocation of corporate overhead and before income taxes 203,984 222,318  
Total assets 8,316,508 7,783,281 8,200,843
Acute Care Hospital Services
      
Segment Reporting Information [Line Items]      
Gross inpatient revenues 3,507,270 3,278,155  
Gross outpatient revenues 1,651,575 1,548,850  
Total net revenues 908,734 926,531  
Income/(loss) before allocation of corporate overhead and income taxes 80,629 130,310  
Allocation of corporate overhead (46,112) (39,359)  
Income/(loss) after allocation of corporate overhead and before income taxes 34,517 90,951  
Total assets 3,077,881 2,878,318  
Behavioral Health Services
      
Segment Reporting Information [Line Items]      
Gross inpatient revenues 1,576,148 1,415,538  
Gross outpatient revenues 185,802 160,673  
Total net revenues 909,544 860,320  
Income/(loss) before allocation of corporate overhead and income taxes 220,775 200,925  
Allocation of corporate overhead (22,367) (20,964)  
Income/(loss) after allocation of corporate overhead and before income taxes 198,408 179,961  
Total assets 4,963,760 4,414,995  
Other
      
Segment Reporting Information [Line Items]      
Gross outpatient revenues 10,848 12,270  
Total net revenues 13,354 6,185  
Income/(loss) before allocation of corporate overhead and income taxes (97,420) (108,917)  
Allocation of corporate overhead 68,479 60,323  
Income/(loss) after allocation of corporate overhead and before income taxes (28,941) (48,594)  
Total assets $ 274,867 $ 489,968