Adjustments to previously reported unaudited condensed consolidated statements of income and comprehensive income (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Licensing revenue	$ 88,935	$ 91,612	$ 278,955	$ 299,334
Other revenue		18,680		38,690
Total revenue	88,935	110,292	278,955	338,024
Selling, general and administrative expenses	65,760	46,878	153,626	138,497
Operating income (loss)	23,175	63,414	125,329	199,527
Income before taxes	2,700	46,973	127,398	188,456
Provision for income taxes	5,673	9,856	44,232	53,922
Net (loss) income	(2,973)	37,117	83,166	134,534
Net income attributable to Iconix Brand Group, Inc.	$ (6,340)	$ 33,684	$ 72,129	$ 124,564
Earnings per share:
Basic	$ (0.13)	$ 0.70	$ 1.50	$ 2.56
Diluted	$ (0.13)	$ 0.58	$ 1.43	$ 2.14
Comprehensive income	$ 1,077	$ 10,643	$ 56,399	$ 105,440
Comprehensive income attributable to Iconix Brand Group, Inc.	$ (2,290)	7,210	$ 45,362	95,470
Scenario Previously Reported
Licensing revenue		95,070		304,778
Other revenue		18,680		44,053
Total revenue		113,750		348,831
Selling, general and administrative expenses		50,190		142,685
Operating income (loss)		63,560		206,146
Income before taxes		47,119		195,075
Provision for income taxes		9,907		56,239
Net (loss) income		37,212		138,836
Net income attributable to Iconix Brand Group, Inc.		$ 33,779		$ 128,866
Earnings per share:
Basic		$ 0.70		$ 2.65
Diluted		$ 0.58		$ 2.21
Comprehensive income		$ 10,738		$ 109,742
Comprehensive income attributable to Iconix Brand Group, Inc.		7,305		99,772
Restatement Adjustment
Licensing revenue		(3,458)		(5,444)
Other revenue				(5,363)
Total revenue		(3,458)		(10,807)
Selling, general and administrative expenses		(3,312)		(4,188)
Operating income (loss)		(146)		(6,619)
Income before taxes		(146)		(6,619)
Provision for income taxes		(51)		(2,317)
Net (loss) income		(95)		(4,302)
Net income attributable to Iconix Brand Group, Inc.		$ (95)		$ (4,302)
Earnings per share:
Basic		$ 0.00		$ (0.09)
Diluted		$ 0.00		$ (0.07)
Comprehensive income		$ (95)		$ (4,302)
Comprehensive income attributable to Iconix Brand Group, Inc.		$ (95)		$ (4,302)