Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Licensing revenue	$ 34,394,000	$ 50,212,000	$ 70,336,000	$ 98,761,000
Type of Revenue [Extensible List]	us-gaap:LicenseMember	us-gaap:LicenseMember	us-gaap:LicenseMember	us-gaap:LicenseMember
Selling, general and administrative expenses	$ 16,435,000	$ 28,643,000	$ 34,528,000	$ 62,241,000
Loss on termination of licenses		5,650,000		5,650,000
Depreciation and amortization	482,000	632,000	974,000	1,286,000
Equity earnings on joint ventures	(1,095,000)	(1,149,000)	(2,137,000)	(1,245,000)
Gain on sale of trademarks		(125,000)		(1,268,000)
Goodwill impairment		37,812,000	0	37,812,000
Trademark impairment		73,335,000		73,335,000
Operating income (loss)	18,572,000	(94,586,000)	36,971,000	(79,050,000)
Other expenses (income):
Interest expense	14,465,000	14,827,000	28,970,000	29,376,000
Interest income	(90,000)	(92,000)	(162,000)	(214,000)
Other income, net	1,140,000	(32,083,000)	(18,795,000)	(58,215,000)
Gain on extinguishment of debt				4,473,000
Foreign currency translation (gain) loss	(258,000)	704,000	369,000	152,000
Other expenses (income) – net	15,257,000	(16,644,000)	10,382,000	(33,374,000)
Income (loss) before income taxes	3,315,000	(77,942,000)	26,589,000	(45,676,000)
(Benefit) provision for income taxes	(130,000)	(2,804,000)	1,838,000	(1,154,000)
Net income (loss)	3,445,000	(75,138,000)	24,751,000	(44,522,000)
Less: Net income attributable to non-controlling interest	2,174,000	4,291,000	5,535,000	7,148,000
Net income (loss) attributable to Iconix Brand Group, Inc.	$ 1,271,000	$ (79,429,000)	$ 19,216,000	$ (51,670,000)
Earnings (loss) per share:
Basic	$ 0.12	$ (12.04)	$ 2.04	$ (8.26)
Diluted	$ 0.12	$ (12.04)	$ 0.08	$ (8.26)
Weighted average number of common shares outstanding:
Basic	10,377	6,598	9,426	6,257
Diluted	10,377	6,598	44,779	6,257