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2. SUMMARY OF ACCOUNTING POLICIES (Details - Earnings Per Share) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income attributable to Radnet, Inc.'s common stockholders	$ 4,205us-gaap_NetIncomeLoss	$ 4,451us-gaap_NetIncomeLoss	$ 5,144us-gaap_NetIncomeLoss	$ (12,424)us-gaap_NetIncomeLoss	$ 1,243us-gaap_NetIncomeLoss	$ (467)us-gaap_NetIncomeLoss	$ 2,686us-gaap_NetIncomeLoss	$ (1,342)us-gaap_NetIncomeLoss	$ 1,376us-gaap_NetIncomeLoss	$ 2,120us-gaap_NetIncomeLoss	$ 59,834us-gaap_NetIncomeLoss
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS
Weighted average shares outstanding - Basic	41,783,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	41,645,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,217,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	40,010,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,244,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,236,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,217,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,314,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	41,070,077us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,140,480us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	37,751,170us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net income per share attributable to Radnet, Inc.'s common stockholders	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.11us-gaap_EarningsPerShareBasic	$ 0.13us-gaap_EarningsPerShareBasic	$ (0.31)us-gaap_EarningsPerShareBasic	$ 0.03us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ 0.03us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 1.58us-gaap_EarningsPerShareBasic
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS
Weighted average shares outstanding - Basic	41,783,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	41,645,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,217,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	40,010,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,244,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,236,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,217,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,314,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	41,070,077us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,140,480us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	37,751,170us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Add nonvested restricted stock subject only to service vesting									994,610us-gaap_WeightedAverageNumberOfSharesRestrictedStock	316,905us-gaap_WeightedAverageNumberOfSharesRestrictedStock	533,014us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Add additional shares issuable upon exercise of stock options and warrants									1,084,509us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	357,150us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	960,502us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Weighted average shares outstanding - Diluted	44,182,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,034,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,830,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	40,010,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,598,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,236,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,830,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,314,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	43,149,196us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,814,535us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,244,686us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net income per share attributable to RadNet, Inc.'s common stockholders	$ 0.10us-gaap_EarningsPerShareDiluted	$ 0.10us-gaap_EarningsPerShareDiluted	$ 0.13us-gaap_EarningsPerShareDiluted	$ (0.31)us-gaap_EarningsPerShareDiluted	$ 0.03us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ 0.03us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 1.52us-gaap_EarningsPerShareDiluted

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