Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Licensing revenue	$ 53,165,000	$ 60,457,000	$ 173,535,000	$ 196,342,000
Selling, general and administrative expenses	21,509,000	29,870,000	73,702,000	91,976,000
Loss on termination of licenses	2,750,000		25,980,000
Depreciation and amortization	592,000	233,000	1,814,000	2,093,000
Equity earnings on joint ventures	(483,000)	(574,000)	(2,475,000)	(3,130,000)
Gain on deconsolidation of joint venture			(3,772,000)
Gain on sale of trademarks	(875,000)	(147,000)	(875,000)	(9,991,000)
Trademark impairment	521,653,000		521,653,000
Goodwill impairment	103,877,000		103,877,000	0
Operating (loss) income	(595,858,000)	31,075,000	(546,369,000)	115,394,000
Other expenses (income):
Interest expense	16,911,000	18,334,000	45,787,000	59,751,000
Interest income	(150,000)	(140,000)	(417,000)	(687,000)
Other income	(2,648,000)	(10,164,000)	(2,649,000)	(10,180,000)
Loss (gain) on extinguishment of debt	1,539,000	(4,186,000)	20,939,000	(8,473,000)
Foreign currency translation loss (gain)	(1,091,000)	733,000	2,755,000	617,000
Other expenses – net	14,561,000	4,577,000	66,415,000	41,028,000
(Loss) income from continuing operations before income taxes	(610,419,000)	26,498,000	(612,784,000)	74,366,000
Provision (benefit) for income taxes	(29,606,000)	9,433,000	(29,220,000)	25,157,000
Net (loss) income from continuing operations	(580,813,000)	17,065,000	(583,564,000)	49,209,000
Less: Net income attributable to non-controlling interest from continuing operations	(30,242,000)	2,885,000	(23,857,000)	9,802,000
Net (loss) income from continuing operations attributable to Iconix Brand Group, Inc.	(550,571,000)	14,180,000	(559,707,000)	39,407,000
(Loss) income from discontinued operations before income taxes	(2,308,000)	3,231,000	(26,232,000)	13,857,000
Gain (loss) on sale of Entertainment segment	(228,000)		104,099,000
Provision (benefit) for income taxes	(406,000)	497,000	28,555,000	3,074,000
Net income (loss) from discontinued operations	(2,130,000)	2,734,000	49,312,000	10,783,000
Less: Net income attributable to non-controlling interest from discontinued operations		1,698,000	2,943,000	4,778,000
Net income (loss) from discontinued operations attributable to Iconix Brand Group, Inc.	(2,130,000)	1,036,000	46,369,000	6,005,000
Net (loss) income attributable to Iconix Brand Group, Inc.	$ (552,701,000)	$ 15,216,000	$ (513,338,000)	$ 45,412,000
(Loss) earnings per share - basic:
Continuing operations	$ (9.64)	$ 0.26	$ (9.83)	$ 0.77
Discontinued operations	(0.04)	0.02	0.81	0.12
(Loss) earnings per share - basic	(9.67)	0.27	(9.02)	0.89
(Loss) earnings per share - diluted:
Continuing operations	(9.64)	0.25	(9.83)	0.75
Discontinued operations	(0.04)	0.02	0.81	0.11
(Loss) earnings per share - diluted	$ (9.67)	$ 0.27	$ (9.02)	$ 0.86
Weighted average number of common shares outstanding:
Basic	57,189	55,584	57,081	51,060
Diluted	57,189	57,355	57,081	52,802