| Cover | Mar. 08, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 8, 2021 |
| Entity File Number | 001-33307 |
| Entity Registrant Name | RadNet, Inc. |
| Entity Central Index Key | 0000790526 |
| Entity Tax Identification Number | 13-3326724 |
| Entity Incorporation, State or Country Code | DE |
| 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 | 445-2800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $.0001 par value |
| Trading Symbol | RDNT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
