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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earning Per Share        
Net Income attributable to Radnet, Inc.'s common stockholders $ 2,946 $ 3,521 $ 2,835 $ 2,645
Weighted average number of common shares outstanding during the year 37,761,316 37,357,840 37,715,723 37,308,038
Basic income per share attributable to Radnet, Inc.'s common stockholders $ 0.08 $ 0.09 $ 0.08 $ 0.07
Nonvested restricted stock subject only to service vesting 521,667    494,744   
Additional shares issuable upon exercise of stock options and warrants 1,147,734 2,462,323 1,005,165 2,068,920
Weighted average number of common shares used in calculating diluted income per share 39,430,717 39,820,163 39,215,632 39,376,958
Diluted income per share attributable to RadNet, Inc.'s common stockholders $ 0.07 $ 0.09 $ 0.07 $ 0.07