Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Licensing revenue	$ 48,548	$ 58,722
Selling, general and administrative expenses	33,599	25,392
Depreciation and amortization	654	653
Equity earnings on joint ventures	(96)	(933)
Gain on sale of trademarks	(1,143)
Operating income	15,534	33,610
Other expenses (income):
Interest expense	14,549	15,049
Interest income	(122)	(126)
Other income	(26,132)	(1)
(Gain) loss on extinguishment of debt	(4,473)	5,482
Foreign currency translation (gain) loss	(551)	429
Other (income) expenses – net	(16,729)	20,833
Income from continuing operations before income taxes	32,263	12,777
Provision for income taxes	1,650	5,887
Net income from continuing operations	30,613	6,890
Less: Net income attributable to non-controlling interest from continuing operations	2,857	2,488
Net income from continuing operations attributable to Iconix Brand Group, Inc.	27,756	4,402
Loss from discontinued operations before income taxes		(12,477)
Benefit for income taxes		(5,098)
Net loss from discontinued operations		(7,379)
Less: Net income attributable to non-controlling interest from discontinued operations		1,303
Net loss from discontinued operations attributable to Iconix Brand Group, Inc.		(8,682)
Net income (loss) attributable to Iconix Brand Group, Inc.	$ 27,756	$ (4,280)
Earnings (loss) per share - basic:
Continuing operations	$ 0.43	$ 0.06
Discontinued operations		(0.15)
Earnings (loss) per share - basic	0.43	(0.09)
Earnings (loss) per share - diluted:
Continuing operations	0.11	0.06
Discontinued operations		(0.15)
Earnings (loss) per share - diluted	$ 0.11	$ (0.09)
Weighted average number of common shares outstanding:
Basic	59,117	56,964
Diluted	82,352	56,964