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Acquisitions and Dispositions - Additional Information (Detail) $ in Thousands		9 Months Ended
	Oct. 01, 2017 Hospital	Sep. 30, 2017 USD ($) Hospital	Sep. 30, 2016 USD ($) Hospital
Business Acquisition [Line Items]
Number of hospitals purchased | Hospital		7	3
Effective date of Acquisition		Oct. 01, 2017
Proceeds from sale of business		$ 24,000	$ 23,000
Subsequent Event [Member]
Business Acquisition [Line Items]
Number of hospitals purchased | Hospital	1
Real Estate and Other Investments [Member]
Business Acquisition [Line Items]
Proceeds from sale of business		24,000	23,000
Pretax gain (loss) on sales of business		10,000	8,000
Hospitals [Member]
Business Acquisition [Line Items]
Aggregate purchase price		1,000,000	343,000
Nonhospital Health Care [Member]
Business Acquisition [Line Items]
Aggregate purchase price		$ 142,000	$ 125,000

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