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Dispositions and Acquisitions - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended |  | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Arbor Group, L.L.C Contract Bed | Jun. 30, 2014 Psychiatric Institute Bed | Sep. 30, 2014 Palo Verde Behavioral Health Bed | Nov. 30, 2010 Cygnet Health Care Limited Facility | Sep. 30, 2014 Cygnet Health Care Limited Hospital Facility Bed | Sep. 30, 2013 Peak Bed | Sep. 30, 2013 Previously Closed Facilities Facility
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |  |  |
Number of management contracts |  |  |  | 3 |  |  |  |  |  |
Number of beds |  |  |  | 66 | 124 | 48 |  | 734 |  |
Cash paid/reserved related to acquisition of property and businesses |  | $ 402,405,000 | $ 1,320,000 |  |  |  |  |  |  |
Number of facilities |  |  |  |  |  |  | 18 | 18 |  | 5
Number of hospitals |  |  |  |  |  |  |  | 16 |  |
Number of nursing homes |  |  |  |  |  |  | 2 | 2 |  |
Aggregate cash proceeds from divestiture of businesses |  | 15,000,000 | 37,000,000 |  |  |  |  |  |  |
Pre-tax gain (loss) proceeds from divestiture of businesses | $ (2,000,000) | $ 8,000,000 |  |  |  |  |  |  |  |
Number of acute care hospital beds included in sale |  |  |  |  |  |  |  |  | 104 |

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