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Segment Reporting (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Segment Reporting Information [Line Items]          
Gross inpatient revenues $ 4,458,731 $ 4,355,903 $ 9,158,841 $ 8,902,928  
Gross outpatient revenues 1,715,767 1,536,950 3,438,145 3,019,365  
Total net revenues 1,729,803 1,714,464 3,527,392 3,440,722  
Income/(loss) before allocation of corporate overhead and income taxes 184,444 182,429 406,762 386,425  
Allocation of corporate overhead 0 0 0 0  
Income/(loss) after allocation of corporate overhead and before income taxes 184,444 182,429 406,762 386,425  
Total assets 7,758,648 7,565,753 7,758,648 7,565,753 7,665,245
Acute Care Hospital Services
          
Segment Reporting Information [Line Items]          
Gross inpatient revenues 3,034,837 2,951,260 6,312,862 6,107,084  
Gross outpatient revenues 1,540,569 1,364,531 3,089,419 2,684,482  
Total net revenues 845,552 863,907 1,772,083 1,755,295  
Income/(loss) before allocation of corporate overhead and income taxes 61,602 91,145 191,450 218,129  
Allocation of corporate overhead (37,979) (30,518) (78,722) (63,324)  
Income/(loss) after allocation of corporate overhead and before income taxes 23,623 60,627 112,728 154,805  
Total assets 2,957,192 2,779,803 2,957,192 2,779,803  
Behavioral Health Services
          
Segment Reporting Information [Line Items]          
Gross inpatient revenues 1,423,894 1,404,643 2,845,979 2,795,844  
Gross outpatient revenues 162,475 157,748 323,733 307,343  
Total net revenues 875,031 844,734 1,739,904 1,673,678  
Income/(loss) before allocation of corporate overhead and income taxes 224,963 189,590 427,459 375,378  
Allocation of corporate overhead (21,071) (15,691) (42,132) (31,416)  
Income/(loss) after allocation of corporate overhead and before income taxes 203,892 173,899 385,327 343,962  
Total assets 4,431,758 4,381,320 4,431,758 4,381,320  
Other
          
Segment Reporting Information [Line Items]          
Gross outpatient revenues 12,723 14,671 24,993 27,540  
Total net revenues 9,220 5,823 15,405 11,749  
Income/(loss) before allocation of corporate overhead and income taxes (102,121) (98,306) (212,147) (207,082)  
Allocation of corporate overhead 59,050 46,209 120,854 94,740  
Income/(loss) after allocation of corporate overhead and before income taxes (43,071) (52,097) (91,293) (112,342)  
Total assets $ 369,698 $ 404,630 $ 369,698 $ 404,630