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Segment Reporting (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] |  |  |  |  |  |  |  |  |  |  |  |
Gross inpatient revenues |  |  |  |  |  |  |  |  |  | $ 40,281,027 | $ 38,531,825 | $ 34,550,480
Gross outpatient revenues |  |  |  |  |  |  |  |  |  | 17,236,319 | 18,733,333 | 15,993,034
Total 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
Income (loss) before allocation of corporate overhead and income taxes |  |  |  |  |  |  |  |  |  | 1,252,083 | 1,066,337 | 1,034,525
Allocation of corporate overhead |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  | 1,252,083 | 1,066,337 | 1,034,525
Total assets |  | 13,476,879 |  |  |  | 11,668,250 |  |  |  | 13,476,879 | 11,668,250 | 11,265,480
Acute Care Hospital Services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross inpatient revenues |  |  |  |  |  |  |  |  |  | 30,562,093 | 28,430,922 | 24,814,959
Gross outpatient revenues |  |  |  |  |  |  |  |  |  | 16,272,520 | 17,666,629 | 14,967,313
Total net revenues |  |  |  |  |  |  |  |  |  | 6,337,304 | 6,164,560 | 5,719,905
Income (loss) before allocation of corporate overhead and income taxes |  |  |  |  |  |  |  |  |  | 693,427 | 713,410 | 708,680
Allocation of corporate overhead |  |  |  |  |  |  |  |  |  | (223,921) | (230,166) | (199,823)
Income before income taxes |  |  |  |  |  |  |  |  |  | 469,506 | 483,244 | 508,857
Total assets |  | 4,927,456 |  |  |  | 4,405,643 |  |  |  | 4,927,456 | 4,405,643 | 4,094,537
Behavioral Health Services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross inpatient revenues | [1] |  |  |  |  |  |  |  |  | 9,718,934 | 10,100,903 | 9,735,521
Gross outpatient revenues | [1] |  |  |  |  |  |  |  |  | 963,799 | 1,066,704 | 1,025,721
Total net revenues | [1] |  |  |  |  |  |  |  |  | 5,208,722 | 5,210,063 | 5,038,874
Income (loss) before allocation of corporate overhead and income taxes | [1] |  |  |  |  |  |  |  |  | 1,023,257 | 900,965 | 915,517
Allocation of corporate overhead | [1] |  |  |  |  |  |  |  |  | (170,849) | (166,571) | (161,282)
Income before income taxes | [1] |  |  |  |  |  |  |  |  | 852,408 | 734,394 | 754,235
Total assets | [1] | 7,044,617 |  |  |  | 6,910,790 |  |  |  | 7,044,617 | 6,910,790 | 6,786,369
Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  |  | 12,871 | 3,636 | 13,499
Income (loss) before allocation of corporate overhead and income taxes |  |  |  |  |  |  |  |  |  | (464,601) | (548,038) | (589,672)
Allocation of corporate overhead |  |  |  |  |  |  |  |  |  | 394,770 | 396,737 | 361,105
Income before income taxes |  |  |  |  |  |  |  |  |  | (69,831) | (151,301) | (228,567)
Total assets |  | $ 1,504,806 |  |  |  | $ 351,817 |  |  |  | $ 1,504,806 | $ 351,817 | $ 384,574
[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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