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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earning Per Share        
Net income attributable to Radnet, Inc.'s common stockholders $ 2,686 $ 2,946 $ 1,344 $ 2,835
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS        
Weighted average number of common shares outstanding during the year 39,217,122 37,761,316 39,038,904 37,715,723
Basic net income per share attributable to Radnet, Inc.'s common stockholders $ 0.07 $ 0.08 $ 0.03 $ 0.08
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS        
Weighted average number of common shares outstanding during the period 39,217,122 37,761,316 39,038,904 37,715,723
Add nonvested restricted stock subject only to service vesting 302,799 521,667 302,438 494,744
Add additional shares issuable upon exercise of stock options and warrants 309,742 1,147,733 511,956 1,005,165
Weighted average number of common shares used in calculating diluted net income per share 39,829,663 39,430,716 39,853,298 39,215,632
Diluted net income per share attributable to RadNet, Inc.'s common stockholders $ 0.07 $ 0.07 $ 0.03 $ 0.07