5. EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income (loss) attributable to RadNet, Inc.'s common stockholders	$ 3,395	$ 5,144	$ (1,159)	$ (7,280)
BASIC NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period	43,370,024	40,817,333	43,059,686	40,413,863
Basic net income (loss) per share attributable to RadNet, Inc.'s common stockholders	$ .08	$ .13	$ (.03)	$ (.18)
DILUTED NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS
Weighted average number of common shares outstanding during the period	44,685,599	43,262,995	43,059,686	40,413,863
Add nonvested restricted stock subject only to service vesting	897,892	1,019,930	0	0
Add additional shares issuable upon exercise of stock options and warrants	417,683	1,425,732	0	0
Weighted average number of common shares used in calculating diluted net income per share	44,685,599	43,262,995	43,059,686	40,413,863
Diluted net income (loss) per share attributable to RadNet, Inc.'s common stockholders	$ .08	$ .12	$ (.03)	$ (.18)