BUSINESS ACQUISITIONS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Aug. 06, 2019	Sep. 18, 2018	Aug. 08, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill				$ 1,428,610	$ 1,425,542	$ 632,469	$ 627,392
Purchase price, net of cash acquired				0	700,170	$ 10,727
BioScrip
Business Acquisition [Line Items]
Share price (in dollars per share)	$ 2.67
Payment of shares in acquisition	$ 125,800
Success-based fees	14,100
Goodwill	796,141
Net sales since acquisition					308,900
Net loss since acquisition					30,100
Payments of transaction costs					25,800
Purchase price	1,102,001
Purchase price, net of cash acquired	1,087,214
Cash paid	714,957
Baptist Health In Little Rock, Arkansas
Business Acquisition [Line Items]
Purchase price			$ 1,000
Home I.V. Specialists, Inc.
Business Acquisition [Line Items]
Payment in settlement of debt		$ 1,800
Percentage of outstanding shares purchased		100.00%
Purchase price, net of cash acquired		$ 11,600
Cash paid		$ 9,800
Reduction of liabilities incurred				$ 1,500	$ 300
First Lien Term Loan | BioScrip | Senior Notes
Business Acquisition [Line Items]
Payment in settlement of debt	$ 575,000