NOTE 16 - QUARTERLY RESULTS OF OPERATIONS (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Note 16 - Quarterly Results Of Operations Details
Net service fee revenue	$ 159,333	$ 160,453	$ 165,351	$ 162,016	$ 155,349	$ 143,021	$ 147,699	$ 139,052
Total operating expenses	152,661	146,613	151,886	150,765	140,204	132,041	132,562	129,653	601,925	534,460	476,944
Total other expenses	13,038	9,738	12,131	12,420	11,982	11,736	12,461	11,544	47,327	47,723	58,774
Equity in earnings of joint ventures	2,319	909	1,986	1,262	1,435	1,038	1,267	1,484	(6,476)	(5,224)	(4,952)
Provision for income taxes	60,606	(30)	(421)	(245)	(102)	(234)	(337)	(147)	(59,910)	820	576
NET INCOME (LOSS)	56,559	4,981	2,899	(152)	4,496	48	3,606	(808)	64,287	7,342	(12,685)
Net income (loss) attributable to noncontrolling interests	(70)	(72)	(47)	(41)	(51)	9	85	68	(230)	111	167
Net income (loss) attributable to Radnet, Inc. common stockholders	$ 56,629	$ 5,053	$ 2,946	$ (111)	$ 4,547	$ 39	$ 3,521	$ (876)	$ 64,517	$ 7,231	$ (12,852)
Basic net income (loss) attributable to Radnet, Inc. common stockholders earnings (loss) per share:	$ 1.47	$ 0.13	$ 0.07	$ 0	$ 0.12	$ 0	$ 0.09	$ (0.02)	$ 1.71	$ 0.19	$ (0.35)
Diluted net income (loss) attributable to Radnet, Inc. common stockholders earnings (loss) per share:	$ 1.42	$ 0.12	$ 0.07	$ 0	$ 0.12	$ 0	$ 0.09	$ (0.02)	$ 1.64	$ 0.19	$ (0.35)
Weighted average shares outstanding
Basic	38,349,000	38,340,000	37,761,000	37,670,000	37,426,000	37,426,000	37,358,000	37,258,000	37,751,170	37,367,736	36,853,477
Diluted	39,796,000	39,861,000	39,431,000	37,670,000	38,059,000	38,470,000	39,820,000	37,258,000	39,244,686	38,785,675	36,853,477