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4. EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Net income (loss) attributable to RadNet, Inc.'s common stockholders $ 5,144 $ 2,686 $ (7,280) $ 1,344
BASIC NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS        
Weighted average number of common shares outstanding during the period 40,817,333 39,217,122 40,413,863 39,038,904
Basic net income (loss) per share attributable to RadNet, Inc.'s common stockholders $ 0.13 $ 0.07 $ (0.18) $ 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 40,817,333 39,217,122 40,413,863 39,038,904
Add nonvested restricted stock subject only to service vesting 1,019,930 302,799 0 302,438
Add additional shares issuable upon exercise of stock options and warrants 1,425,732 309,742 0 511,956
Weighted average number of common shares used in calculating diluted net income per share 43,262,995 39,829,663 40,413,863 39,853,298
Diluted net income (loss) per share attributable to RadNet, Inc.'s common stockholders $ 0.12 $ 0.07 $ (0.18) $ 0.03