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		$ 97,398	$ 95,116	$ 193,212	$ 205,516
Total revenue		97,398	95,116	193,212	205,516
Selling, general and administrative expenses		47,037	43,916	88,062	91,587
Equity on earnings on joint ventures	[1]	(1,463)	(4,261)	(2,650)	(6,043)
Operating income		51,824	61,860	107,800	126,371
Other expenses (income) - net	[1]	21,335	20,698	(19,007)	12,180
Income before taxes		30,489	41,162	126,807	114,191
Provision for income taxes		11,536	14,213	38,807	34,210
Net income		18,953	26,949	88,000	79,981
Less: Net income attributable to non-controlling interest		5,215	3,522	8,902	6,639
Net income attributable to Iconix Brand Group, Inc.		$ 13,738	$ 23,427	$ 79,098	$ 73,342
Earnings per share:
Basic		$ 0.28	$ 0.48	$ 1.64	$ 1.50
Diluted		$ 0.28	$ 0.40	$ 1.56	$ 1.26
Comprehensive income		$ 26,368	$ 24,904	$ 57,689	$ 76,538
Comprehensive income attributable to Iconix Brand Group, Inc.		21,153	21,382	48,787	69,899
Gains on sale of trademarks	[2]		(6,399)		(6,399)
As Previously Reported
Licensing revenue		96,221	96,071	190,018	207,723
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
Other expenses (income) - net	[1]	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
Less: Net income attributable to non-controlling interest		4,603	3,463	7,670	6,537
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
Other revenue	[2]		16,038		20,009
Adjustments
Licensing revenue		1,177	(955)	3,194	(2,207)
Total revenue		1,177	(16,993)	3,194	(22,216)
Selling, general and administrative expenses		381	61	198	(32)
Equity on earnings on joint ventures	[1]	(1,463)	(4,261)	(2,650)	(6,043)
Operating income		2,259	(6,394)	5,646	(9,742)
Other expenses (income) - net	[1]	3,352	5,608	3,538	17,550
Income before taxes		(1,093)	(12,002)	2,108	(27,292)
Provision for income taxes		(657)	(4,326)	249	(9,856)
Net income		(436)	(7,676)	1,859	(17,436)
Less: Net income attributable to non-controlling interest		612	59	1,232	102
Net income attributable to Iconix Brand Group, Inc.		$ (1,048)	$ (7,735)	$ 627	$ (17,538)
Earnings per share:
Basic		$ (0.02)	$ (0.16)	$ 0.01	$ (0.36)
Diluted		$ (0.02)	$ (0.13)	$ 0.01	$ (0.30)
Comprehensive income		$ (443)	$ (7,389)	$ 2,365	$ (18,259)
Comprehensive income attributable to Iconix Brand Group, Inc.		$ (1,055)	(7,448)	$ 1,133	(18,361)
Other revenue	[2]		(16,038)		(20,009)
Gains on sale of trademarks	[2]		$ (6,399)		$ (6,399)

[1] Equity earnings on joint ventures was previously reported within other expenses (income) – net and has been reclassified and is being presented as a component of operating income.

[2] Gains on sale of trademarks was previously reported as other revenue. Many of the gains recorded upon formation of certain joint ventures were reversed as a result of consolidation. The gains that were not impacted by consolidation, and therefore not reversed, have been reclassified and are being presented as a separate line item above operating income.