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Dispositions and Acquisitions - Additional Information (Detail) - Entity [Domain] | 6 Months Ended
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Jun. 30, 2015 USD ($) Bed | Jun. 30, 2014 USD ($) Bed
Acquisitions And Divestitures [Line Items] |  |
Cash paid/reserved related to acquisition of property and businesses | $ 34,500,000 | $ 71,000,000
Number of beds | Bed | 24 | 66
Proceeds from Divestiture of Businesses | $ 0 |
Aggregate cash proceeds from divestiture of businesses |  | $ 11,000,000
Pre-tax gain (loss) proceeds from divestiture of businesses |  | $ 10,000,000
Cygnet Hospital-Taunton |  |
Acquisitions And Divestitures [Line Items] |  |
Number of beds | Bed | 46 |
Psychiatric Institute |  |
Acquisitions And Divestitures [Line Items] |  |
Number of beds | Bed |  | 124
Palo Verde Behavioral Health |  |
Acquisitions And Divestitures [Line Items] |  |
Number of beds | Bed |  | 48

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + 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=56944662&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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