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Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net revenues |  | $ 2,687,516 | $ 2,612,858 |
Total assets |  | 11,023,517 | 10,448,259 | $ 10,761,828
Behavioral Health Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues | [1] | 1,237,996 | 1,218,122 |
Total assets | [1] | 6,649,732 | 6,517,608 |
Behavioral Health Services | Located in U.K. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues |  | 115,000 | 100,000 |
Total assets |  | $ 1,176,000 | $ 992,000 |
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $115 million and $100 million for the three-month periods ended March 31, 2018 and 2017, respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.176 billion and $992 million as of March 31, 2018 and 2017, respectively.

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