Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 15, 2020	Jun. 30, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-37751
Entity Registrant Name	American Renal Associates Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-2170749
Entity Address, Address Line One	500 Cummings Center, Suite 6550
Entity Address, City or Town	Beverly,
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01915
City Area Code	978
Local Phone Number	922-3080
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	ARA
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Entity Public Float			$ 97,768,103
Entity Common Stock, Shares Outstanding		32,996,704
Entity Central Index Key	0001498068
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Documents Incorporated by Reference	Portions of the registrant’s proxy statement for its 2020 annual meeting of stockholders are incorporated by reference in Part III of this Form 10-K.