2. SUMMARY OF ACCOUNTING POLICIES (Details - Earnings Per Share) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income (loss) attributable to RadNet, Inc.'s common stockholders	$ 5,039	$ 3,226	$ 3,107	$ 7,326
BASIC NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period	48,010,726	46,953,705	47,937,215	46,760,583
Basic net income (loss) per share attributable to RadNet, Inc.'s common stockholders	$ 0.10	$ 0.07	$ 0.06	$ 0.16
DILUTED NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS
Weighted average number of common share outstanding during the period	48,010,726	46,953,705	47,937,215	46,760,583
Add nonvested restricted stock subject only to service vesting	424,397	315,830	372,462	237,595
Add additional shares issuable upon exercise of stock options and warrants	180,269	308,216	171,627	241,183
Weighted average number of common shares used in calculating diluted net income per share	48,615,392	47,577,750	48,481,305	47,239,360
Diluted net income (loss) per share attributable to RadNet, Inc.'s common stockholders	$ 0.10	$ 0.07	$ 0.06	$ 0.16
Stock options excluded from the computation of diluted per share amounts:
Weighted average shares for which the exercise price exceeds average market price of common stock	0	0	8,333	225,050