CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Total Radnet, Inc.'s Equity	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2018			48,977,485
Beginning balance, value at Dec. 31, 2018	$ 200,253	$ 127,184	$ 5	$ 242,835	$ 2,259	$ (117,915)	$ 73,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options (in shares)			10,000
Issuance of common stock upon exercise of options	50	50		50
Issuance of common stock under the equity compensation plan (in shares)			701,042
Issuance of common stock under the equity compensation plan	0
Stock-based compensation expense	5,638	5,638		5,638
Issuance of common stock for acquisition (in shares)			440,207
Issuance of common stock for acquisition	6,000	6,000		6,000
Forfeiture of restricted stock (in shares)			(1,500)
Forfeiture of restricted stock	(5)	(5)		(5)
Sale of noncontrolling interests, net of taxes	5,097	3,089		3,089			2,008
Purchase of noncontrolling interests	(1,818)						(1,818)
Contribution from noncontrolling partner	750						750
Change in cumulative foreign currency translation adjustment	(5)	(5)			(5)
Change in fair value cash flow hedge, net of taxes	(9,198)	(9,198)			(9,198)
Amount of loss reclassified from accumulated OCI into income (prior period effective portion)	0
Net (loss) income	5,668	1,165				1,165	4,503
Ending balance (in shares) at Jun. 30, 2019			50,127,234
Ending balance, value at Jun. 30, 2019	212,430	133,918	$ 5	257,607	(6,944)	(116,750)	78,512
Beginning balance (in shares) at Mar. 31, 2019			50,081,478
Beginning balance, value at Mar. 31, 2019	213,538	135,900	$ 5	256,488	1,055	(121,648)	77,638
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of options (in shares)			0
Issuance of common stock upon exercise of options	0
Issuance of common stock under the equity compensation plan (in shares)			47,256
Issuance of common stock under the equity compensation plan	0
Stock-based compensation expense	1,124	1,124		1,124
Forfeiture of restricted stock (in shares)			(1,500)
Forfeiture of restricted stock	(5)	(5)		(5)
Purchase of noncontrolling interests	(1,818)						(1,818)
Change in cumulative foreign currency translation adjustment	3	3			3
Change in fair value cash flow hedge, net of taxes	(8,002)	(8,002)			(8,002)
Amount of loss reclassified from accumulated OCI into income (prior period effective portion)	0
Other	(1)	(1)				(1)
Net (loss) income	7,591	4,899				4,899	2,692
Ending balance (in shares) at Jun. 30, 2019			50,127,234
Ending balance, value at Jun. 30, 2019	212,430	133,918	$ 5	257,607	(6,944)	(116,750)	78,512
Beginning balance (in shares) at Dec. 31, 2019			50,314,328
Beginning balance, value at Dec. 31, 2019	233,139	151,685	$ 5	262,865	(8,026)	(103,159)	81,454
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the equity compensation plan (in shares)			416,817
Issuance of common stock under the equity compensation plan	0
Stock-based compensation expense	8,136	8,136		8,136
Issuance of common stock for acquisition (in shares)			823,615
Issuance of common stock for acquisition	33,011	33,011		33,011
Change in cumulative foreign currency translation adjustment	(6)	(6)			(6)
Change in fair value cash flow hedge, net of taxes	(18,958)	(18,958)			(18,958)
Amount of loss reclassified from accumulated OCI into income (prior period effective portion)	892	892			892
Net (loss) income	(22,958)	(26,952)				(26,952)	3,994
Ending balance (in shares) at Jun. 30, 2020			51,554,760
Ending balance, value at Jun. 30, 2020	233,256	147,808	$ 5	304,012	(26,098)	(130,111)	85,448
Beginning balance (in shares) at Mar. 31, 2020			50,694,375
Beginning balance, value at Mar. 31, 2020	207,189	123,375	$ 5	269,461	(26,574)	(119,517)	83,814
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the equity compensation plan (in shares)			36,770
Issuance of common stock under the equity compensation plan	0
Stock-based compensation expense	1,540	1,540		1,540
Issuance of common stock for acquisition (in shares)			823,615
Issuance of common stock for acquisition	33,011	33,011		33,011
Change in cumulative foreign currency translation adjustment	(7)	(7)			(7)
Change in fair value cash flow hedge, net of taxes	(409)	(409)			(409)
Amount of loss reclassified from accumulated OCI into income (prior period effective portion)	892	892			892
Net (loss) income	(8,960)	(10,594)				(10,594)	1,634
Ending balance (in shares) at Jun. 30, 2020			51,554,760
Ending balance, value at Jun. 30, 2020	$ 233,256	$ 147,808	$ 5	$ 304,012	$ (26,098)	$ (130,111)	$ 85,448