CHANGES IN OWNERSHIP INTEREST IN CONSOLIDATED SUBSIDIARIES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Noncontrolling Interest [Abstract]
Net loss attributable to American Renal Associates Holdings, Inc.	$ (7,234)	$ (10,479)
Increase (decrease) in paid-in capital for the sales of noncontrolling interest	3,448	(1,328)
Decrease in paid-in capital for the purchase of noncontrolling interest and adjustments to ownership interest	0	50
Net transfers to/from noncontrolling interests	3,448	(1,278)
Net loss attributable to American Renal Holdings Associates, Inc., net of transfers to/from noncontrolling interests	$ (3,786)	$ (11,757)