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Segment Reporting (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross inpatient revenues |  | $ 8,468,381 | $ 7,601,856 | $ 25,845,309 | $ 23,062,840 |
Gross outpatient revenues |  | 3,936,556 | 3,435,625 | 11,934,261 | 10,520,504 |
Total net revenues |  | 2,648,913 | 2,541,864 | 8,017,782 | 7,767,078 |
Income/(loss) before allocation of corporate overhead and income taxes |  | 229,067 | 220,354 | 827,075 | 833,051 |
Allocation of corporate overhead |  | 0 | 0 | 0 | 0 |
Income/(loss) after allocation of corporate overhead and before income taxes |  | 229,067 | 220,354 | 827,075 | 833,051 |
Total assets |  | 11,273,585 | 10,639,360 | 11,273,585 | 10,639,360 | $ 10,761,828
Acute Care Hospital Services |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross inpatient revenues |  | 6,009,303 | 5,344,625 | 18,535,079 | 16,373,472 |
Gross outpatient revenues |  | 3,694,389 | 3,199,066 | 11,169,376 | 9,780,173 |
Total net revenues |  | 1,383,050 | 1,316,748 | 4,232,673 | 4,072,752 |
Income/(loss) before allocation of corporate overhead and income taxes |  | 147,448 | 106,707 | 513,174 | 452,388 |
Allocation of corporate overhead |  | (49,967) | (45,680) | (149,760) | (137,031) |
Income/(loss) after allocation of corporate overhead and before income taxes |  | 97,481 | 61,027 | 363,414 | 315,357 |
Total assets |  | 4,027,573 | 3,736,676 | 4,027,573 | 3,736,676 |
Behavioral Health Services |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross inpatient revenues | [1] | 2,459,078 | 2,257,231 | 7,310,230 | 6,689,368 |
Gross outpatient revenues | [1] | 242,167 | 236,559 | 764,885 | 740,331 |
Total net revenues | [1] | 1,262,472 | 1,224,548 | 3,774,551 | 3,685,230 |
Income/(loss) before allocation of corporate overhead and income taxes | [1] | 234,170 | 228,673 | 734,362 | 732,749 |
Allocation of corporate overhead | [1] | (40,244) | (39,707) | (120,822) | (119,021) |
Income/(loss) after allocation of corporate overhead and before income taxes | [1] | 193,926 | 188,966 | 613,540 | 613,728 |
Total assets | [1] | 6,871,765 | 6,610,811 | 6,871,765 | 6,610,811 |
Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gross inpatient revenues |  | 0 | 0 | 0 | 0 |
Gross outpatient revenues |  | 0 | 0 | 0 | 0 |
Total net revenues |  | 3,391 | 568 | 10,558 | 9,096 |
Income/(loss) before allocation of corporate overhead and income taxes |  | (152,551) | (115,026) | (420,461) | (352,086) |
Allocation of corporate overhead |  | 90,211 | 85,387 | 270,582 | 256,052 |
Income/(loss) after allocation of corporate overhead and before income taxes |  | (62,340) | (29,639) | (149,879) | (96,034) |
Total assets |  | $ 374,247 | $ 291,873 | $ 374,247 | $ 291,873 |
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $130 million and $111 million for the three-month periods ended September 30, 2018 and 2017, respectively, and approximately $364 million and $317 million for the nine-month periods ended September 30, 2018 and 2017 respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.231 billion and $1.094 billion as of September 30, 2018 and 2017, respectively.

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