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Dispositions and Acquisitions - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 Facility Bed | Sep. 30, 2018 USD ($) Bed | Sep. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |
Acquisition, cash paid | $ |  | $ 108,000,000 | $ 20,000,000
Aggregate cash proceeds from divestiture of businesses | $ |  |  | $ 0
The Limes |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate cash proceeds from divestiture of businesses | $ |  | $ 14,000,000 |
Number of beds | Bed |  | 18 |
Gulfport Behavioral Health System |  |  |
Business Acquisition [Line Items] |  |  |
Number of beds | Bed |  | 109 |
Danshell Group | Located in U.K. |  |  |
Business Acquisition [Line Items] |  |  |
Number of beds | Bed | 288 |  |
Number of behavioral health care facilities | Facility | 25 |  |

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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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