SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Net income attributable to RadNet, Inc. common stockholders	$ 3,044	$ 10,650	$ 24,727
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period (in shares)	63,580,059	56,293,336	52,496,679
Basic net income per share attributable to RadNet, Inc. common stockholders (in dollars per share)	$ 0.05	$ 0.19	$ 0.47
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period (in shares)	63,580,059	56,293,336	52,496,679
Add nonvested restricted stock subject only to service vesting (in shares)	202,995	172,139	259,539
Add additional shares issuable upon exercise of stock options, warrants and holdback shares (in shares)	875,245	855,395	664,815
Weighted average number of common shares used in calculating diluted net income per share (in shares)	64,658,299	57,320,870	53,421,033
Changes in fair value associated with contingently issuable shares	$ 0	$ (724)	$ 0
Net income attributable to RadNet, Inc's common stockholders for diluted share calculation	$ 3,044	$ 9,926	$ 24,727
Diluted net income per share attributable to RadNet, Inc. common stockholders (in dollars per share)	$ 0.05	$ 0.17	$ 0.46
Shares issuable upon the exercise of stock options
Stock options and non-vested restricted awards excluded from the computation of diluted per share amounts as their effect would be antidilutive:
Weighted average shares for which the exercise price exceeds average market price of common stock (in shares)	754,131	152,723	47,792
Weight average shares for which the exercise price exceeds the average market price of common stock
Stock options and non-vested restricted awards excluded from the computation of diluted per share amounts as their effect would be antidilutive:
Weighted average shares for which the exercise price exceeds average market price of common stock (in shares)	70,760	0	0