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Segment Reporting (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
Segment Reporting Information [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
Total assets |  | 13,476,879 |  |  |  | 11,668,250 |  |  |  | 13,476,879 | 11,668,250 | 11,265,480
Provision for asset impairment |  |  |  |  |  |  |  |  |  | 0 | 97,631 | 49,310
Behavioral Health Services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [1] |  |  |  |  |  |  |  |  | 5,208,722 | 5,210,063 | 5,038,874
Total assets | [1] | 7,044,617 |  |  |  | 6,910,790 |  |  |  | 7,044,617 | 6,910,790 | 6,786,369
Behavioral Health Services | Located in U.K. |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 584,000 | 554,000 | 505,000
Total assets |  | $ 1,334,000 |  |  |  | $ 1,270,000 |  |  |  | $ 1,334,000 | 1,270,000 | 1,224,000
Tradename | Behavioral Health Services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Provision for intangible asset impairment |  |  |  |  |  |  |  |  |  |  |  | $ 49,000
Tradename | Real Property Assets | Behavioral Health Services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Provision for asset impairment |  |  |  |  |  |  |  |  |  |  | $ 98,000 |
[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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