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Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues |  | $ 2,681,353 | $ 2,612,356 | $ 5,368,869 | $ 5,225,214 |
Total assets |  | 11,069,417 | 10,552,487 | 11,069,417 | 10,552,487 | $ 10,761,828
Behavioral Health Services |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues | [1] | 1,274,083 | 1,242,561 | 2,512,079 | 2,460,683 |
Total assets | [1] | 6,746,272 | 6,541,328 | 6,746,272 | 6,541,328 |
Behavioral Health Services | Located in U.K. |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues |  | 119,000 | 106,000 | 234,000 | 206,000 |
Total assets |  | $ 1,123,000 | $ 1,028,000 | $ 1,123,000 | $ 1,028,000 |
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $119 million and $106 million for the three-month periods ended June 30, 2018 and 2017, respectively, and approximately $234 million and $206 million for the six-month periods ended June 30, 2018 and 2017 respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.123 billion and $1.028 billion as of June 30, 2018 and 2017, respectively.

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