CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Accumulated Deficit [Member]	Total Radnet, Inc.'s Equity [Member]	Noncontrolling Interests [Member]	Total
Beginning balance, shares at Dec. 31, 2017	47,723,915
Beginning balance, value at Dec. 31, 2017	$ 5	$ 212,261	$ (548)	$ (150,158)	$ 61,560	$ 8,365	$ 69,925
Issuance of common stock upon exercise of options, shares	5,000
Issuance of common stock upon exercise of options, value		10			10		10
Stock-based compensation		6,264			6,264		6,264
Issuance of restricted stock and other awards, shares	607,160
Issuance of restricted stock and other awards, value		100			100		100
Forfeiture of restricted stock, shares	(1,150)
Forfeiture of restricted stock, value		(7)			(7)		(7)
Sale to noncontrolling interests, net of taxes		15,593			15,593	25,186	40,779
Special distribution from noncontrolling interest		2,894			2,894	(9,175)	(6,281)
Distributions paid to noncontrolling interest						(913)	(913)
Purchase of non-controlling interests		(43)			(43)	(157)	(200)
Change in cumulative foreign currency translation adjustment			(65)		(65)		(65)
Change in fair value of cash flow hedge, net of taxes			4,889		4,889		4,889
Net (loss) income				3,107	3,107	3,679	6,786
Ending balance, shares at Sep. 30, 2018	48,334,925
Ending balance, value at Sep. 30, 2018	$ 5	$ 237,072	$ 4,276	$ (147,051)	$ 94,302	$ 26,985	$ 121,287