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Dispositions and Acquisitions - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2018 USD ($) Bed | Mar. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |
Acquisition, cash paid | $ 21,000,000 | $ 18,000,000
Aggregate cash proceeds from divestiture of businesses | $ 0 | $ 0
Gulfport Behavioral Health System |  |
Business Acquisition [Line Items] |  |
Number of beds | Bed | 109 |

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- Definition Number of beds available in acquired hospital in business acquisition. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Details
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