CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
NET REVENUE
Net service fee revenue		$ 810,623	$ 776,200
Total net revenue	$ 975,146	922,186	884,535
OPERATING EXPENSES
Cost of operations, excluding depreciation and amortization	867,547	802,377	775,801
Depreciation and amortization	72,899	66,796	66,610
(Gain) loss on sale and disposal of equipment	(2,054)	1,142	767
Loss on impairment	3,937	0	0
Severance costs	1,931	1,821	2,877
Total operating expenses	944,260	872,136	846,055
INCOME FROM OPERATIONS	30,886	50,050	38,480
OTHER INCOME AND EXPENSES
Interest expense	43,456	40,623	43,455
Meaningful use incentive	0	(250)	(2,808)
Equity in earnings of joint ventures	(11,377)	(13,554)	(9,767)
Gain on re-measurement of pre-existing interest	(39,539)	0	0
Gain on sale of imaging centers and medical practice	0	(3,146)	0
Gain on return of common stock	0	0	(5,032)
Other (income) expenses	(181)	(8)	196
Total other (income) expenses	(7,641)	23,665	26,044
INCOME BEFORE INCOME TAXES	38,527	26,385	12,436
Provision for income taxes	(394)	(24,310)	(4,432)
NET INCOME	38,133	2,075	8,004
Net income attributable to noncontrolling interests	5,890	2,022	774
NET INCOME ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS	$ 32,243	$ 53	$ 7,230
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS (in dollars per share)	$ 0.67	$ 0.00	$ 0.16
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC. COMMON STOCKHOLDERS (in dollars per share)	$ 0.66	$ 0.00	$ 0.15
Weighted average shares outstanding, basic (in shares)	48,114,275	46,880,775	46,244,188
Weighted average shares outstanding, diluted (in shares)	48,678,999	47,401,921	46,655,032
Health Care, Patient Service
NET REVENUE
Service fee revenue, net of contractual allowances and discounts	$ 868,741	$ 857,178	$ 821,587
Provision for bad debts		(46,555)	(45,387)
Capitation Arrangements
NET REVENUE
Service fee revenue, net of contractual allowances and discounts	$ 106,405	$ 111,563	$ 108,335