SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Earnings Per Share) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Net (loss) income attributable to RadNet, Inc. common stockholders	$ (14,840)	$ 14,756	$ 32,243
BASIC NET (LOSS) INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period (in shares)	50,891,791	49,674,858	48,114,275
Basic net (loss) income per share attributable to RadNet, inc. common stockholders (in dollars per share)	$ (0.29)	$ 0.30	$ 0.67
DILUTED NET (LOSS) INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period (in shares)	50,891,791	49,674,858	48,114,275
Add nonvested restricted stock subject only to service vesting (in shares)	0	208,963	180,631
Add additional shares issuable upon exercise of stock options and warrants (in shares)	0	360,185	384,093
Weighted average number of common shares used in calculating diluted net income per share (in shares)	50,891,791	50,244,006	48,678,999
Diluted net (loss) income per share attributable to RadNet, Inc. common stockholders (in dollars per share)	$ (0.29)	$ 0.29	$ 0.66
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)	554,444	0	0
Restricted 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)		0	0