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14. QUARTERLY RESULTS OF OPERATIONS (Details-Statements of Operations) (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
Quarterly Results Of Operations Details-statements Of Operations
Net service fee revenue	$ 185,552us-gaap_SalesRevenueNet	$ 184,059us-gaap_SalesRevenueNet	$ 179,082us-gaap_SalesRevenueNet	$ 168,876us-gaap_SalesRevenueNet	$ 178,338us-gaap_SalesRevenueNet	$ 175,188us-gaap_SalesRevenueNet	$ 176,520us-gaap_SalesRevenueNet	$ 172,940us-gaap_SalesRevenueNet	$ 717,569us-gaap_SalesRevenueNet	$ 702,986us-gaap_SalesRevenueNet	$ 647,153us-gaap_SalesRevenueNet
Total operating expenses	170,676us-gaap_OperatingExpenses	168,824us-gaap_OperatingExpenses	163,436us-gaap_OperatingExpenses	161,328us-gaap_OperatingExpenses	164,634us-gaap_OperatingExpenses	166,599us-gaap_OperatingExpenses	163,535us-gaap_OperatingExpenses	164,615us-gaap_OperatingExpenses	664,264us-gaap_OperatingExpenses	659,383us-gaap_OperatingExpenses	601,925us-gaap_OperatingExpenses
Total other expenses	9,951rdnt_TotalOtherExpenses	10,401rdnt_TotalOtherExpenses	10,803rdnt_TotalOtherExpenses	25,468rdnt_TotalOtherExpenses	11,325rdnt_TotalOtherExpenses	11,056rdnt_TotalOtherExpenses	9,385rdnt_TotalOtherExpenses	12,145rdnt_TotalOtherExpenses	56,623rdnt_TotalOtherExpenses	43,911rdnt_TotalOtherExpenses	47,327rdnt_TotalOtherExpenses
Equity in earnings of joint ventures	(2,248)us-gaap_IncomeLossFromEquityMethodInvestments	(2,009)us-gaap_IncomeLossFromEquityMethodInvestments	(1,646)us-gaap_IncomeLossFromEquityMethodInvestments	(1,067)us-gaap_IncomeLossFromEquityMethodInvestments	(1,713)us-gaap_IncomeLossFromEquityMethodInvestments	(1,617)us-gaap_IncomeLossFromEquityMethodInvestments	(1,658)us-gaap_IncomeLossFromEquityMethodInvestments	(1,206)us-gaap_IncomeLossFromEquityMethodInvestments	(6,970)us-gaap_IncomeLossFromEquityMethodInvestments	(6,194)us-gaap_IncomeLossFromEquityMethodInvestments	(6,476)us-gaap_IncomeLossFromEquityMethodInvestments
(Provision for) benefit from income taxes	(2,878)us-gaap_IncomeTaxExpenseBenefit	(2,334)us-gaap_IncomeTaxExpenseBenefit	(1,233)us-gaap_IncomeTaxExpenseBenefit	4,478us-gaap_IncomeTaxExpenseBenefit	(2,744)us-gaap_IncomeTaxExpenseBenefit	483us-gaap_IncomeTaxExpenseBenefit	(2,497)us-gaap_IncomeTaxExpenseBenefit	1,248us-gaap_IncomeTaxExpenseBenefit	(1,967)us-gaap_IncomeTaxExpenseBenefit	(3,510)us-gaap_IncomeTaxExpenseBenefit	55,227us-gaap_IncomeTaxExpenseBenefit
Net (loss) income	4,295us-gaap_ProfitLoss	4,509us-gaap_ProfitLoss	5,256us-gaap_ProfitLoss	(12,375)us-gaap_ProfitLoss	1,348us-gaap_ProfitLoss	(367)us-gaap_ProfitLoss	2,761us-gaap_ProfitLoss	(1,366)us-gaap_ProfitLoss	1,685us-gaap_ProfitLoss	2,376us-gaap_ProfitLoss	59,604us-gaap_ProfitLoss
Net (loss) income attributable to noncontrolling intersts	90us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	58us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	112us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	49us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	105us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	100us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	75us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(24)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	309us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	256us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(230)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net (loss) income attributable to Radnet, Inc. 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 (loss) income attributable to Radnet, Inc. common stockholders (loss) earnings per share:	$ 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 (loss) income attributable to Radnet, Inc. common stockholders (loss) earnings per share:	$ 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
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
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

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