Summary of Restatement Adjustments on Consolidated Statements of Income and Comprehensive Income (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Licensing revenue	$ 96,221	$ 96,071	$ 190,018	$ 207,723
Other revenue		16,038		20,009
Total revenue	96,221	112,109	190,018	227,732
Selling, general and administrative expenses	46,656	43,855	87,864	91,619
Operating income	49,565	68,254	102,154	136,113
Interest income	(1,016)	(482)	(1,773)	(1,083)
Other expenses (income) - net	17,983	15,090	(22,545)	(5,370)
Income before taxes	31,582	53,164	124,699	141,483
Provision for income taxes	12,193	18,539	38,558	44,066
Net income	19,389	34,625	86,141	97,417
Net income attributable to Iconix Brand Group, Inc.	$ 14,786	$ 31,162	$ 78,471	$ 90,880
Earnings per share:
Basic	$ 0.31	$ 0.64	$ 1.63	$ 1.85
Diluted	$ 0.30	$ 0.53	$ 1.55	$ 1.56
Comprehensive income	$ 26,811	$ 32,293	$ 55,324	$ 94,797
Comprehensive income attributable to Iconix Brand Group, Inc.	22,208	28,830	47,654	88,260
As Previously Reported
Licensing revenue	98,459	97,542	193,846	209,709
Other revenue		21,401		25,372
Total revenue	98,459	118,943	193,846	235,081
Selling, general and administrative expenses	49,087	44,293	93,242	92,495
Operating income	49,372	74,650	100,604	142,586
Interest income	(1,182)		(1,996)
Other expenses (income) - net	17,817		(22,768)
Income before taxes	31,555	59,560	123,372	147,956
Provision for income taxes	12,184	20,778	38,094	46,332
Net income	19,371	38,782	85,278	101,624
Net income attributable to Iconix Brand Group, Inc.	$ 14,768	$ 35,319	$ 77,608	$ 95,087
Earnings per share:
Basic	$ 0.31	$ 0.73	$ 1.61	$ 1.94
Diluted	$ 0.30	$ 0.60	$ 1.53	$ 1.63
Comprehensive income	$ 26,793	$ 36,450	$ 54,461	$ 99,004
Comprehensive income attributable to Iconix Brand Group, Inc.	22,190	32,987	46,791	92,467
Adjustments
Licensing revenue	(2,238)	(1,471)	(3,828)	(1,986)
Other revenue		(5,363)		(5,363)
Total revenue	(2,238)	(6,834)	(3,828)	(7,349)
Selling, general and administrative expenses	(2,431)	(438)	(5,378)	(876)
Operating income	193	(6,396)	1,550	(6,473)
Interest income	166		223
Other expenses (income) - net	166		223
Income before taxes	27	(6,396)	1,327	(6,473)
Provision for income taxes	9	(2,239)	464	(2,266)
Net income	18	(4,157)	863	(4,207)
Net income attributable to Iconix Brand Group, Inc.	$ 18	$ (4,157)	$ 863	$ (4,207)
Earnings per share:
Basic	$ 0.00	$ (0.09)	$ 0.02	$ (0.09)
Diluted	$ 0.00	$ (0.07)	$ 0.02	$ (0.07)
Comprehensive income	$ 18	$ (4,157)	$ 863	$ (4,207)
Comprehensive income attributable to Iconix Brand Group, Inc.	$ 18	$ (4,157)	$ 863	$ (4,207)