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Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  | $ 2,642,787 | $ 2,541,864 | $ 2,612,356 | $ 2,612,858 | $ 2,475,685 | $ 2,409,872 | $ 2,430,855 | $ 2,449,798 | $ 10,409,865 | $ 9,766,210 | $ 9,043,451
Total assets |  | 10,761,828 |  |  |  | 10,317,802 |  |  |  | 10,761,828 | 10,317,802 | 9,615,444
Behavioral Health Services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | [1] |  |  |  |  |  |  |  |  | 4,906,719 | 4,645,007 | 4,400,335
Total assets | [1] | 6,648,818 |  |  |  | 6,440,195 |  |  |  | 6,648,818 | 6,440,195 | 5,867,088
Behavioral Health Services | Located in U.K. |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  | 429,000 | 241,000 | 203,000
Total assets |  | $ 1,098 |  |  |  | $ 965,000 |  |  |  | $ 1,098 | $ 965,000 | $ 521,000
[1] | Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $429 million in 2017, $241 million in 2016 and $203 million in 2015. Total assets at our U.K. behavioral health care facilities were approximately $1.098 billion as of December 31, 2017, $965 million as of December 31, 2016 and $521 million as of December 31, 2015.

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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