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, 2015 USD ($) Hospital Bed	Mar. 31, 2015 Bed	Sep. 30, 2016 USD ($) Bed	Sep. 30, 2015 USD ($)
Acquisitions And Divestitures [Line Items]
Acquisition of property and businesses					$ 136,221	$ 183,103
Alpha Hospitals Holdings Limited
Acquisitions And Divestitures [Line Items]
Number of beds | Bed			305
Number of hospital facilities | Hospital			4
Minimum
Acquisitions And Divestitures [Line Items]
Ownership interests purchased		26.10%
Maximum
Acquisitions And Divestitures [Line Items]
Ownership interests purchased		27.50%
Behavioral Health Services
Acquisitions And Divestitures [Line Items]
Number of beds | Bed				46
Aggregate cash proceeds from divestiture of businesses			$ 3,000
Pahrump, Nevada
Acquisitions And Divestitures [Line Items]
Number of beds | Bed					25
Las Vegas, Nevada | Acute Care Hospital Services
Acquisitions And Divestitures [Line Items]
Number of hospital facilities | Hospital	6	6
Payments to purchase minority ownership interests	$ 445,000	$ 445,000
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%
Las Vegas, Nevada | Acute Care Hospital Services | Maximum
Acquisitions And Divestitures [Line Items]
Ownership interests purchased					27.50%