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Dispositions and Acquisitions and Purchase of Third-Party Ownership Interests - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2016 USD ($) Hospital | Jun. 30, 2016 USD ($) Hospital | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) Bed
Acquisitions And Divestitures [Line Items] |  |  |  |
Acquisition of property and businesses |  |  | $ 19,610 | $ 136,221
Pahrump, Nevada |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |
Number of beds | Bed |  |  |  | 25
Las Vegas, Nevada | Acute Care Hospital Services |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |
Payments to purchase minority ownership interests | $ 445,000 | $ 445,000 |  |
Number of hospital facilities | Hospital | 6 | 6 |  |
Purchase price of minority ownership interests | $ 418,000 | $ 418,000 |  |
Return of reserve capital to purchase of minority ownership interests | $ 27,000 | $ 27,000 |  |
Las Vegas, Nevada | Acute Care Hospital Services | Minimum |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |
Ownership interests purchased | 26.10% | 26.10% |  |
Las Vegas, Nevada | Acute Care Hospital Services | Maximum |  |  |  |
Acquisitions And Divestitures [Line Items] |  |  |  |
Ownership interests purchased | 27.50% | 27.50% |  |

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