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4. EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earning Per Share        
Net Income attributable to Radnet, Inc.'s common stockholders $ 5,053 $ 39 $ 7,888 $ 2,684
Weighted average number of common shares outstanding during the year 38,340,482 37,426,460 37,737,467 37,347,946
Basic income per share attributable to Radnet, Inc.'s common stockholders $ 0.13 $ 0.00 $ 0.21 $ 0.07
Weighted average number of Common Shares outstanding during the year 38,340,482 37,426,460 37,737,467 37,347,946
Nonvested restricted stock subject only to service vesting 560,000    516,655   
Additional shares issuable upon exercise of stock options and warrants 960,203 1,043,513 990,177 1,731,052
Weighted average number of common shares used in calculating diluted income per share 39,860,685 38,469,973 39,244,299 39,078,998
Diluted income per share attributable to RadNet, Inc.'s common stockholders $ 0.13 $ 0.00 $ 0.2 $ 0.07