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Dispositions and Acquisitions - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2015 USD ($) Facility Bed | Sep. 30, 2015 Bed Hospital | Mar. 31, 2015 Bed | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) Facility Bed
Acquisitions And Divestitures [Line Items] |  |  |  |  |
Cash paid/reserved related to acquisition of property and businesses | $ |  |  |  | $ 183,103 | $ 402,405
Pre-tax gain (loss) proceeds from divestiture of businesses | $ |  |  |  |  | $ 10,000
Alpha Hospitals Holdings Limited |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |
Number of beds |  | 305 |  |  |
Number of hospitals | Hospital |  | 4 |  |  |
Behavioral Health Services |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |
Number of beds |  |  | 46 |  | 48
Aggregate cash proceeds from divestiture of businesses | $ |  |  |  | $ 3,000 | $ 15,000
Behavioral Health Services | Cygnet Health Care Limited |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |
Number of facilities | Facility |  |  |  |  | 16
Behavioral Health Services and Outpatient Treatment Center |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |
Number of beds |  |  |  |  | 124
Subsequent Event |  |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |  |
Cash paid/reserved related to acquisition of property and businesses | $ | $ 350,000 |  |  |  |
Number of facilities | Facility | 4 |  |  |  |
Number of beds | 322 |  |  |  |
Number of outpatient centers | Facility | 8 |  |  |  |
Number of expansion beds in progress | 140 |  |  |  |

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