Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Mar. 12, 2019	Jun. 30, 2018
Document and Entity Information
Entity Registrant Name	RadNet, Inc.
Entity Central Index Key	0000790526
Document Type	10-K
Trading Symbol	RDNT
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity a Well-known Seasoned Issuer	No
Entity a Voluntary Filer	No
Entity's Reporting Status Current	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 664,338,846
Entity Common Stock, Shares Outstanding		50,071,479
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2018
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false