Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Mar. 05, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-33307
Entity Registrant Name	RadNet, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3326724
Entity Address, Address Line One	1510 Cotner Avenue
Entity Address, City or Town	Los Angeles,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90025
City Area Code	310
Local Phone Number	478-7808
Title of 12(b) Security	Common Stock, $.0001 par value
Trading Symbol	RDNT
Security Exchange Name	NASDAQ
Entity a Well-known Seasoned Issuer	No
Entity a Voluntary Filer	No
Entity's Reporting Status Current	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 691.2
Entity Common Stock, Shares Outstanding		52,272,092
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement for the 2021 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this annual report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the close of the registrant’s fiscal year.
Entity Central Index Key	0000790526
Amendment Flag	false
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020