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4. EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net income (loss) attributable to RadNet, Inc.'s common stockholders $ 7,987 $ 4,451 $ 6,828 $ (2,829)
BASIC NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS        
Weighted average number of common shares outstanding during the period 43,637,022 41,644,606 43,247,002 40,734,083
Basic net income (loss) per share attributable to RadNet, Inc.'s common stockholders $ .18 $ .11 $ .16 $ (.07)
DILUTED NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS        
Weighted average number of common shares outstanding during the period 44,751,936 44,033,580 44,704,323 40,734,083
Add nonvested restricted stock subject only to service vesting 437,689 1,001,190 484,810 0
Add additional shares issuable upon exercise of stock options and warrants 677,225 1,387,784 972,511 0
Weighted average number of common shares used in calculating diluted net income per share 44,751,936 44,033,580 44,704,323 40,734,083
Diluted net income (loss) per share attributable to RadNet, Inc.'s common stockholders $ .18 $ .10 $ .15 $ (.07)