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Segment Reporting (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross inpatient revenues |  |  |  |  |  |  |  |  |  | $ 34,550,480 | $ 30,838,191 | $ 27,060,212
Gross outpatient revenues |  |  |  |  |  |  |  |  |  | 15,993,034 | 14,109,290 | 12,276,200
Total net revenues |  | $ 2,754,496 | $ 2,648,913 | $ 2,681,353 | $ 2,687,516 | $ 2,642,787 | $ 2,541,864 | $ 2,612,356 | $ 2,612,858 | 10,772,278 | 10,409,865 | 9,766,210
Income (loss) before allocation of corporate overhead and income taxes |  |  |  |  |  |  |  |  |  | 1,034,525 | 1,135,009 | 1,156,358
Allocation of corporate overhead |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  | 1,034,525 | 1,135,009 | 1,156,358
Total assets |  | 11,265,480 |  |  |  | 10,761,828 |  |  |  | 11,265,480 | 10,761,828 | 10,317,802
Acute Care Hospital Services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross inpatient revenues |  |  |  |  |  |  |  |  |  | 24,814,959 | 21,888,207 | 19,042,627
Gross outpatient revenues |  |  |  |  |  |  |  |  |  | 14,967,313 | 13,115,881 | 11,374,098
Total net revenues |  |  |  |  |  |  |  |  |  | 5,719,905 | 5,484,683 | 5,112,950
Income (loss) before allocation of corporate overhead and income taxes |  |  |  |  |  |  |  |  |  | 708,680 | 641,857 | 557,472
Allocation of corporate overhead |  |  |  |  |  |  |  |  |  | (199,823) | (182,713) | (170,767)
Income before income taxes |  |  |  |  |  |  |  |  |  | 508,857 | 459,144 | 386,705
Total assets |  | 4,094,537 |  |  |  | 3,849,214 |  |  |  | 4,094,537 | 3,849,214 | 3,723,075
Behavioral Health Services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross inpatient revenues | [1] |  |  |  |  |  |  |  |  | 9,735,521 | 8,949,984 | 8,017,585
Gross outpatient revenues | [1] |  |  |  |  |  |  |  |  | 1,025,721 | 993,409 | 902,102
Total net revenues | [1] |  |  |  |  |  |  |  |  | 5,038,874 | 4,906,719 | 4,645,007
Income (loss) before allocation of corporate overhead and income taxes | [1] |  |  |  |  |  |  |  |  | 915,517 | 968,974 | 1,030,734
Allocation of corporate overhead | [1] |  |  |  |  |  |  |  |  | (161,282) | (158,735) | (154,843)
Income before income taxes | [1] |  |  |  |  |  |  |  |  | 754,235 | 810,239 | 875,891
Total assets | [1] | 6,786,369 |  |  |  | 6,648,818 |  |  |  | 6,786,369 | 6,648,818 | 6,440,195
Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  |  | 13,499 | 18,463 | 8,253
Income (loss) before allocation of corporate overhead and income taxes |  |  |  |  |  |  |  |  |  | (589,672) | (475,822) | (431,848)
Allocation of corporate overhead |  |  |  |  |  |  |  |  |  | 361,105 | 341,448 | 325,610
Income before income taxes |  |  |  |  |  |  |  |  |  | (228,567) | (134,374) | (106,238)
Total assets |  | $ 384,574 |  |  |  | $ 263,796 |  |  |  | $ 384,574 | $ 263,796 | $ 154,532
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $505 million in 2018, $429 million in 2017 and $241 million in 2016. Total assets at our U.K. behavioral health care facilities were approximately $1.224 billion as of December 31, 2018, $1.098 billion as of December 31, 2017 and $965 million as of December 31, 2016. In addition, 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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