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Schedule of Disaggregates Revenue by Major Source (Parenthetical) (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation Of Revenue [Line Items]        
Net revenues $ 3,197,880,000 $ 2,729,754,000 $ 6,210,867,000 $ 5,559,421,000
Acute Care Hospital Services        
Disaggregation Of Revenue [Line Items]        
Net revenues 1,754,431,000 1,467,506,000 3,448,973,000 2,988,555,000
Acute Care Hospital Services | CARES Act and Other Grant Revenue        
Disaggregation Of Revenue [Line Items]        
Net revenues 2,000,000 157,000,000 11,000,000 157,000,000
Behavioral Health Services        
Disaggregation Of Revenue [Line Items]        
Net revenues [1] 1,431,497,000 1,259,123,000 2,746,834,000 2,565,232,000
Behavioral Health Services | CARES Act and Other Grant Revenue        
Disaggregation Of Revenue [Line Items]        
Net revenues $ 173,000 $ 61,000,000 $ 2,000,000 $ 61,000,000
[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $172 million and $136 million for the three-month periods ended June 30, 2021 and 2020, respectively, and approximately $337 million and $273 million for the six-month periods ended June 30, 2021 and 2020, respectively.  Total assets at our U.K. behavioral health care facilities were approximately $1.369 billion and $1.192 billion as of June 30, 2021 and 2020, respectively.