Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Licensing revenue	$ 35,942	$ 48,548
Type of Revenue [Extensible List]	us-gaap:LicenseMember	us-gaap:LicenseMember
Selling, general and administrative expenses	$ 18,094	$ 33,599
Depreciation and amortization	492	654
Equity earnings on joint ventures	(1,042)	(96)
Gain on sale of trademarks		(1,143)
Operating income	18,398	15,534
Other expenses (income):
Interest expense	14,504	14,549
Interest income	(72)	(122)
Other income	(19,935)	(26,132)
Gain on extinguishment of debt		4,473
Foreign currency translation loss (gain)	627	(551)
Other income – net	4,876	16,729
Income before income taxes	23,274	32,263
Provision for income taxes	1,968	1,650
Net income	21,306	30,613
Less: Net income attributable to non-controlling interest	3,361	2,857
Net income attributable to Iconix Brand Group, Inc.	$ 17,945	$ 27,756
Earnings (loss) per share:
Basic	$ 2.12	$ 4.28
Diluted	$ (0.01)	$ 1.09
Weighted average number of common shares outstanding:
Basic	8,465	5,912
Diluted	44,786	8,235