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Acquisitions and Divestitures - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) Facility Bed | Dec. 31, 2017 USD ($)
2019 Acquisitions of Assets and Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition, cash paid | $ 8,000,000 |  |
2018 Acquisitions of Assets and Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition, cash paid |  | $ 110,000,000 |
Goodwill recognition description | Goodwill of the facilities acquired during each of the last 3 years is computed, pursuant to the residual method, by deducting the fair value of the acquired assets and liabilities from the total purchase price. The factors that contribute to the recognition of goodwill, which may also influence the purchase price, include the following for each of the acquired facilities: (i) the historical cash flows and income levels; (ii) the reputations in their respective markets; (iii) the nature of the respective operations, and; (iv) the future cash flows and income growth projections. |  |
Danshell Group [Member] | Located in U.K. |  |  |
Business Acquisition [Line Items] |  |  |
Number of behavioral health care facilities | Facility |  | 25 |
Gulfport Behavioral Health System | Located in Gulfport |  |  |
Business Acquisition [Line Items] |  |  |
Number of beds | Bed |  | 109 |
2017 Acquisitions of Assets and Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition, cash paid |  |  | $ 23,000,000
2019 Divestiture of Assets |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate cash proceeds from divestiture of businesses | $ 9,000,000 |  |
2018 Divestiture of Assets and Businesses | Located in U.K. |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate cash proceeds from divestiture of businesses |  | $ 13,000,000 |
Number of beds | Bed |  | 18 |
2017 Divestiture of Assets and Businesses |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate cash proceeds from divestiture of businesses |  |  | $ 0

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- Definition This element represents a qualitative description of the factors that make up the goodwill recognized in a business combination, such as expected synergies by the entity to be derived from combining operations of the acquiree, intangible assets that do not qualify for separate recognition, and such other factors as may apply. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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