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