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Schedule of Disaggregates Revenue by Major Source (Parenthetical) (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 3,155,999,000 | $ 2,912,541,000 | $ 9,366,866,000 | $ 8,471,962,000
Acute Care Hospital Services |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | 1,822,027,000 | 1,610,003,000 | 5,271,000,000 | 4,598,558,000
Acute Care Hospital Services | CARES Act and Other Grant Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | 2,000,000 | 4,000,000 | 13,000,000 | 161,000,000
Behavioral Health Services |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues | [1] | 1,328,293,000 | 1,299,591,000 | 4,075,127,000 | 3,864,823,000
Behavioral Health Services | CARES Act and Other Grant Revenue |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Net revenues |  | $ 114,000 | $ 9,000,000 | $ 2,000,000 | $ 52,000,000
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $174 million and $155 million for the three-month periods ended September 30, 2021 and 2020, respectively, and approximately $511 million and $429 million for the nine-month periods ended September 30, 2021 and 2020, respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.338 billion and $1.257 billion as of September 30, 2021 and 2020, respectively.

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