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4. EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Net income (loss) attributable to RadNet, Inc.'s common stockholders $ 3,625 $ 3,395 $ 1,902 $ (1,159)
BASIC NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS        
Weighted average number of common shares outstanding during the period 46,558,944 43,370,024 46,576,631 43,059,686
Basic net income (loss) per share attributable to RadNet, Inc.'s common stockholders $ .08 $ .08 $ .04 $ (0.03)
DILUTED NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS        
Weighted average number of common shares outstanding during the period 46,558,944 43,370,024 46,576,631 43,059,686
Add nonvested restricted stock subject only to service vesting 77,162 897,892 155,447 0
Add additional shares issuable upon exercise of stock options and warrants 246,277 417,683 228,148 0
Weighted average number of common shares used in calculating diluted net income per share 46,882,383 44,685,599 46,960,226 43,059,686
Diluted net income (loss) per share attributable to RadNet, Inc.'s common stockholders $ 0.08 $ .08 $ .04 $ (0.03)