CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 431	$ 362
Accounts receivable, net	134,939	129,194
Current portion of deferred tax assets	8,792	7,607
Prepaid expenses and other current assets	20,213	18,737
Total current assets	164,375	155,900
PROPERTY AND EQUIPMENT, NET	217,443	216,560
OTHER ASSETS
Goodwill	197,090	193,871
Other intangible assets	52,236	51,674
Deferred financing costs	11,387	11,977
Investment in joint ventures	27,959	28,598
Deferred tax assets, net of current portion	53,054	52,790
Deposits and other	3,590	3,749
Total assets	727,134	715,119
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts payable, accrued expenses and other	112,808	105,929
Due to affiliates	1,495	1,602
Deferred revenue	1,276	1,273
Current portion of deferred rent	1,262	1,164
Current portion of notes payable	5,226	4,703
Current portion of obligations under capital leases	3,138	3,942
Total current liabilities	125,205	118,613
LONG-TERM LIABILITIES
Deferred rent, net of current portion	16,185	15,850
Line of credit	34,500	33,000
Notes payable, net of current portion	537,799	537,009
Obligations under capital lease, net of current portion	3,350	3,753
Other non-current liabilities	8,481	8,895
Total liabilities	725,520	717,120
STOCKHOLDERS' EQUITY (DEFICIT)
Common stock - $.0001 par value, 200,000,000 shares authorized; 39,889,196, and 38,540,482 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively	4	4
Paid-in-capital	172,037	168,415
Accumulated other comprehensive income (loss)	(20)	39
Accumulated deficit	(172,435)	(171,093)
Total Radnet, Inc.'s stockholders' equity (deficit)	(414)	(2,635)
Noncontrolling interests	2,028	634
Total stockholders' equity (deficit)	1,614	(2,001)
Total liabilities and stockholders' equity (deficit	$ 727,134	$ 715,119