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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]                      
Net income attributable to Radnet, Inc.'s common stockholders $ (7,276) $ 3,229 $ 5,310 $ (1,210) $ 3,681 $ 1,647 $ 3,625 $ (1,723) $ 53 $ 7,230 $ 7,709
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS                      
Weighted average shares outstanding - basic 47,237 46,954 46,756 46,560 45,967 45,869 46,559 46,581 46,880,775 46,244,188 43,805,794
Basic net income per share attributable to Radnet, Inc. common stockholders $ (0.15) $ 0.07 $ 0.11 $ (0.03) $ 0.08 $ 0.04 $ 0.08 $ (0.04) $ 0.00 $ 0.16 $ 0.18
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS                      
Weighted average shares outstanding - basic 47,237 46,954 46,756 46,560 45,967 45,869 46,559 46,581 46,880,775 46,244,188 43,805,794
Add nonvested restricted stock subject only to service vesting                 274,940 220,416 865,326
Add additional shares issuable upon exercise of stock options and warrants                 246,206 190,428 500,252
Weighted average number of shares used in calculating diluted net income per share 47,886 47,578 47,196 46,560 46,389 46,334 46,882 46,581 47,401,921 46,655,032 45,171,372
Diluted net income per share attributable to RadNet, Inc. common stockholders $ (0.15) $ 0.07 $ 0.11 $ (0.03) $ 0.08 $ 0.04 $ 0.08 $ (0.04) $ 0.00 $ 0.15 $ 0.17
Stock options excluded from the computation of diluted per share amounts:                      
Weighted average shares for which the exercise price exceeds average market price of common stock                 175,037 245,313 260,000