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3. EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net loss attributable to RadNet, Inc.'s common stockholders $ (4,554)us-gaap_NetIncomeLoss $ (12,424)us-gaap_NetIncomeLoss
BASIC AND DILUTED NET LOSS PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS    
Weighted average number of common shares outstanding during the period 42,747,329us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 40,010,080us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic and diluted net loss per share attributable to RadNet, Inc.'s common stockholders $ (0.11)us-gaap_EarningsPerShareBasicAndDiluted $ (0.31)us-gaap_EarningsPerShareBasicAndDiluted