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2. SUMMARY OF ACCOUNTING POLICIES (Details - Earnings Per Share) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]                      
Net income attributable to Radnet, Inc.'s common stockholders $ 3,681 $ 1,647 $ 3,625 $ (1,723) $ 881 $ 7,987 $ 3,395 $ (4,554) $ 7,230 $ 7,709 $ 1,376
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS                      
Weighted average shares outstanding - Basic 45,967,000 45,869,000 46,559,000 46,581,000 45,454,000 43,637,000 43,370,000 42,747,000 46,244,188 43,805,794 41,070,077
Basic net income per share attributable to Radnet, Inc.'s common stockholders $ .08 $ .04 $ .08 $ (.04) $ .02 $ .18 $ .08 $ (.11) $ .16 $ 0.18 $ .03
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS                      
Weighted average shares outstanding during the period 45,967,000 45,869,000 46,559,000 46,581,000 45,454,000 43,637,000 43,370,000 42,747,000 46,244,188 43,805,794 41,070,077
Add nonvested restricted stock subject only to service vesting                 220,416 865,326 994,610
Add additional shares issuable upon exercise of stock options and warrants                 190,428 500,252 1,084,509
Weighted average shares outstanding - Diluted 46,389,000 46,334,000 46,882,000 46,581,000 46,545,000 44,752,000 44,686,000 42,747,000 46,655,032 45,171,372 43,149,196
Diluted net income per share attributable to RadNet, Inc.'s common stockholders $ .08 $ .04 $ .08 $ (.04) $ .02 $ .18 $ .08 $ (.11) $ .15 $ .17 $ .03