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Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues |  | $ 2,541,864 | $ 2,409,872 | $ 7,767,078 | $ 7,290,525 |
Total assets |  | 10,639,360 | 9,673,639 | 10,639,360 | 9,673,639 | $ 10,317,802
Behavioral Health Services |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues | [1] | 1,224,548 | 1,153,880 | 3,685,230 | 3,489,681 |
Total assets | [1] | 6,610,811 | 5,927,564 | 6,610,811 | 5,927,564 |
Behavioral Health Services | Located in U.K. |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues |  | 111,000 | 60,000 | 317,000 | 185,000 |
Total assets |  | $ 1,094,000 | $ 485,000 | $ 1,094,000 | $ 485,000 |
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $111 million and $60 million for the three-month periods ended September 30, 2017 and 2016, respectively, and approximately $317 million and $185 million for the nine-month periods ended September 30, 2017 and 2016, respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.094 billion and $485 million as of September 30, 2017 and 2016, respectively.

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