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Schedule of Disaggregates Revenue by Major Source (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | $ 3,086,935 | $ 2,912,541 | $ 2,729,754 | $ 2,829,667 | $ 2,896,247 | $ 2,822,453 | $ 2,855,168 | $ 2,804,391 | $ 11,558,897 | $ 11,378,259 | $ 10,772,278
Acute Care Hospital Services |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 6,337,304 | 6,164,560 | 5,719,905
Acute Care Hospital Services | CARES Act and Other Grant Revenue |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 316,000 |  |
Behavioral Health Services |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [1] |  |  |  |  |  |  |  |  | 5,208,722 | $ 5,210,063 | $ 5,038,874
Behavioral Health Services | CARES Act and Other Grant Revenue |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | $ 97,000 |  |
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $584 million in 2020, $554 million in 2019 and $505 million in 2018. Total assets at our U.K. behavioral health care facilities were approximately $1.334 billion as of December 31, 2020, $1.270 billion as of December 31, 2019 and $1.224 billion as of December 31, 2018. In addition, included in our 2019 Behavioral Health Services operating segment Income (loss) before allocation of corporate overhead and income taxes is a pre-tax $98 million provision for asset impairment to reduce the carrying value of a tradename intangible asset and real property assets. Included in our 2018 Behavioral Health Services operating segment Income (loss) before allocation of corporate overhead and income taxes is a pre-tax $49 million provision for asset impairment to reduce the carrying value of a tradename intangible asset.

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