SIGNIFICANT ACCOUNTING POLICIES - Insurance and Segments (Details)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accruals for General and Professional Liability Risks
Risk-free discount rate (as a percent)	2.25%	2.09%
Revenue generated by general hospitals (as a percentage)	78.00%	83.00%	87.00%

The interest rate used to discount the estimated cash flows associated with the payment of malpractice claims.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 450
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6491354&loc=d3e6052-115624

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=68058157&loc=d3e18780-107790

Name:	us-gaap_MalpracticeLossContingencyDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration