CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit	Radnet, Inc. Stockholders' Equity	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2016		46,574,904
Beginning balance, value at Dec. 31, 2016	$ 52,053	$ 4	$ 198,387	$ 306	$ (150,211)	$ 48,486	$ 3,567
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		867,248
Stock-based compensation	7,834	$ 1	7,833			7,834
Non cash severance	1,047
Issuance of stock for acquisitions (in shares)		281,763
Issuance of stock for acquisitions	2,500		2,500			2,500
Sale to noncontrolling interests, net of taxes	3,541		3,541			3,541
Contributions from noncontrolling interests	4,304						4,304
Distributions paid to noncontrolling interests	(1,528)						(1,528)
Change in cumulative foreign currency translation adjustment	26			26		26
Change in fair value of cash flow hedge, net of taxes	(880)			(880)		(880)
Net income	2,075				53	53	2,022
Ending balance, value at Dec. 31, 2017	69,925	$ 5	212,261	(548)	(150,158)	61,560	8,365
Ending balance (in shares) at Dec. 31, 2017		47,723,915
Beginning balance (in shares) at Dec. 31, 2016		46,574,904
Beginning balance, value at Dec. 31, 2016	52,053	$ 4	198,387	306	(150,211)	48,486	3,567
Ending balance, value at Dec. 31, 2018	200,253	$ 5	242,835	2,259	(117,915)	127,184	73,069
Ending balance (in shares) at Dec. 31, 2018		48,977,485
Beginning balance (in shares) at Dec. 31, 2017		47,723,915
Beginning balance, value at Dec. 31, 2017	69,925	$ 5	212,261	(548)	(150,158)	61,560	8,365
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock upon exercise of options (in shares)		10,000
Issuance of stock upon exercise of options	20		20			20
Stock-based compensation (in shares)		713,160
Stock-based compensation	7,719	$ 0	7,719			7,719
Forfeiture of restricted stock (in shares)		(1,150)
Forfeiture of restricted stock	(7)		(7)			(7)
Non cash severance	0
Purchase of noncontrolling interests	(200)		(43)			(43)	(157)
Issuance of stock for acquisitions (in shares)		531,560
Issuance of stock for acquisitions	8,000		8,000			8,000
Sale to noncontrolling interests, net of taxes	34,657		11,991			11,991	22,666
Special distribution from noncontrolling interest	(6,281)		2,894			2,894	(9,175)
Contributions from noncontrolling interests	2,640						2,640
Distributions paid to noncontrolling interests	(1,427)						(1,427)
Re-measurement of noncontrolling interest upon change in control	44,267						44,267
Change in cumulative foreign currency translation adjustment	(69)			(69)		(69)
Change in fair value of cash flow hedge, net of taxes	2,876			2,876		2,876
Net income	38,133				32,243	32,243	5,890
Ending balance, value at Dec. 31, 2018	200,253	$ 5	242,835	2,259	(117,915)	127,184	73,069
Ending balance (in shares) at Dec. 31, 2018		48,977,485
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock upon exercise of options (in shares)		12,500
Issuance of stock upon exercise of options	75		75			75
Stock-based compensation (in shares)		771,042
Stock-based compensation	8,735		8,735			8,735
Forfeiture of restricted stock (in shares)		(1,500)
Forfeiture of restricted stock	(5)		(5)			(5)
Non-cash severance (in shares)		12,692
Non cash severance	188		188
Issuance of stock for acquisitions (in shares)		542,109
Issuance of stock for acquisitions	7,500		7,500			7,500
Sale to noncontrolling interests, net of taxes	5,545		3,537			3,537	2,008
Contributions from noncontrolling interests	750						750
Distributions paid to noncontrolling interests	(3,057)						(3,057)
Change in cumulative foreign currency translation adjustment	(32)			(32)		(32)
Change in fair value of cash flow hedge, net of taxes	(10,253)			(10,253)		(10,253)
Net income	23,440				14,756	14,756	8,684
Ending balance, value at Dec. 31, 2019	$ 233,139	$ 5	$ 262,865	$ (8,026)	$ (103,159)	$ 151,685	$ 81,454
Ending balance (in shares) at Dec. 31, 2019		50,314,328