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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earning Per Share        
Net loss attributable to Radnet, Inc.'s common stockholders $ (467) $ 5,053 $ 877 $ 7,888
BASIC AND DILUTED NET LOSS PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS        
Weighted average number of common shares outstanding during the year 39,235,863 38,340,482 39,105,522 37,737,467
Basic and diluted net loss per share attributable to Radnet, Inc.'s common stockholders $ (0.01) $ 0.13 $ 0.02 $ 0.21
DILUTED NET (LOSS) INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS        
Weighted average number of common shares outstanding during the period 39,235,863 38,340,482 39,105,522 37,737,467
Add nonvested restricted stock subject only to service vesting    560,000 311,419 516,655
Add additional shares issuable upon exercise of stock options and warrants    960,203 469,199 990,177
Weighted average number of common shares used in calculating diluted net income per share 39,235,863 39,860,685 39,886,140 39,244,299
Diluted net (loss) income per share attributable to RadNet, Inc.'s common stockholders $ (0.01) $ 0.13 $ 0.02 $ 0.20