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Dispositions and Acquisitions - Additional Information (Detail) (USD $) | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013
Significant Acquisitions and Disposals [Line Items] |  |
Cash paid/reserved related to acquisition of property and businesses | $ 71,000,000 | $ 1,320,000
Aggregate cash proceeds from divestiture of businesses | 11,000,000 | 34,000,000
Pre-tax gain proceeds from divestiture of businesses | $ 10,000,000 |
Arbor Group, L.L.C |  |
Significant Acquisitions and Disposals [Line Items] |  |
Number of management contracts | 3 |
Number of beds | 66 |
Psychiatric Institute |  |
Significant Acquisitions and Disposals [Line Items] |  |
Number of beds | 124 |
Palo Verde Behavioral Health |  |
Significant Acquisitions and Disposals [Line Items] |  |
Number of beds | 48 |
Previously Closed Facilities |  |
Significant Acquisitions and Disposals [Line Items] |  |
Number of facilities |  | 3
Peak Behavioral Health Services |  |
Significant Acquisitions and Disposals [Line Items] |  |
Number of acute care hospital beds included in sale |  | 104

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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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: 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=31042434&loc=d3e3213-108585 + Details
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