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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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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e848-128460 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e957-107759 + Details
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