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Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues |  | $ 2,612,356 | $ 2,430,855 | $ 5,225,214 | $ 4,880,653 |
Total assets |  | 10,552,487 | 9,540,930 | 10,552,487 | 9,540,930 | $ 10,317,802
Behavioral Health Services |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues | [1] | 1,242,561 | 1,174,755 | 2,460,683 | 2,335,801 |
Total assets | [1] | 6,541,328 | 5,920,483 | 6,541,328 | 5,920,483 |
Behavioral Health Services | Located in U.K. |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues |  | 106,000 | 64,000 | 206,000 | 125,000 |
Total assets |  | $ 1,028,000 | $ 490,000 | $ 1,028,000 | $ 490,000 |
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $106 million and $64 million for the three-month periods ended June 30, 2017 and 2016, respectively, and approximately $206 million and $125 million for the six-month periods ended June 30, 2017 and 2016, respectively. Total assets at our U.K. behavioral health care facilities were approximately $1,028 million and $490 million as of June 30, 2017 and 2016, respectively.

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