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Dispositions and Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Palo Verde Behavioral Health Bed | Apr. 30, 2014 Arbor Group, L.L.C Subsequent Event Contract Bed | Apr. 30, 2014 Psychiatric Institute Subsequent Event Bed | Mar. 31, 2013 Previously Closed Facilities Facility
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |
Number of management contracts |  |  |  | 3 |  |
Number of beds |  |  | 48 | 66 | 124 |
Payment to acquired real properties |  |  | $ 3 |  |  |
Aggregate cash proceeds from divestiture of businesses | 11 | 7 |  |  |  |
Pre-tax gain proceeds from divestiture of businesses | $ 10 |  |  |  |  |
Number of facilities |  |  |  |  |  | 2

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