Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Licensing revenue	$ 23,634	$ 27,951
Type of Revenue [Extensible List]	us-gaap:LicenseMember	us-gaap:LicenseMember
Selling, general and administrative expenses	$ 13,094	$ 17,150
Depreciation and amortization	298	273
Equity (earnings) loss on joint ventures	(72)	1,645
Gain on sale of trademarks	(14,959)
Trademark impairment		13,733
Operating income (loss)	25,273	(4,850)
Other expenses (income):
Interest expense	14,655	17,056
Interest income		(40)
Other loss (income), net	2,777	(795)
Foreign currency translation gain	(1,359)	(65)
Other expenses – net	16,073	16,156
Income (loss) before income taxes	9,200	(21,006)
Provision (Benefit) for income taxes	2,261	(5)
Net income (loss)	6,939	(21,001)
Less: Net income attributable to non-controlling interest	2,751	825
Net income (loss) attributable to Iconix Brand Group, Inc.	$ 4,188	$ (21,826)
Earnings (loss) per share:
Basic	$ 0.30	$ (1.89)
Diluted	$ 0.26	$ (1.89)
Weighted average number of common shares outstanding:
Basic	13,805	11,772
Diluted	31,628	11,772