CONSOLIDATED STATEMENTS OF OPERATIONS (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
NET SERVICE FEE REVENUE
Service fee revenue, net of contractual allowances and discounts									$ 673,057	$ 607,460	$ 540,652
Provision for bad debts									(25,904)	(22,339)	(21,995)
Net service fee revenue									647,153	585,121	518,657
OPERATING EXPENSES
Cost of operations									542,993	477,828	420,973
Depreciation and amortization									57,740	57,481	53,997
Loss (gain) on sale and disposal of equipment									456	(2,240)	1,136
Severance costs									736	1,391	838
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
INCOME FROM OPERATIONS									45,228	50,661	41,713
OTHER INCOME AND EXPENSES
Interest expense									53,783	52,798	48,398
Loss on extinguishment of debt											9,871
Gain on deconsolidation of joint venture									(2,777)
Other (income) expenses									(3,679)	(5,075)	505
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
(LOSS) INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF JOINT VENTURES									(2,099)	2,938	(17,061)
Benefit from (provision for) income taxes	(60,606)	30	421	245	102	234	337	147	59,910	(820)	(576)
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
NET INCOME (LOSS)	56,559	4,981	2,899	(152)	4,496	48	3,606	(808)	64,287	7,342	(12,685)
Net (loss) income 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) PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS	$ 1.47	$ 0.13	$ 0.07	$ 0	$ 0.12	$ 0	$ 0.09	$ (0.02)	$ 1.71	$ 0.19	$ (0.35)
DILUTED NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS	$ 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