Restatement - 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
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Licensing revenue		$ 91,332	$ 89,965	$ 284,544	$ 295,481
Total revenue		91,332	89,965	284,544	295,481
Selling, general and administrative expenses		63,900	46,827	151,961	138,413
Gains on sale of trademarks		0	0	0	(6,399)	[1]
Equity earnings on joint ventures	[2]	(350)	(2,639)	(3,000)	(8,683)
Operating income		27,782	45,777	135,583	172,150
Other expenses (income) - net	[2]	22,461	20,528	3,454	32,708
Income before income taxes		5,321	25,249	132,129	139,442
Provision for income taxes		6,275	8,867	45,083	43,078
Net (loss) income		(954)	16,382	87,046	96,364
Less: Net income attributable to non-controlling interest		4,433	3,527	13,335	10,165
Net (loss) income attributable to Iconix Brand Group, Inc.		$ (5,387)	$ 12,855	$ 73,711	$ 86,199
Earnings (loss) per share:
Basic		$ (0.11)	$ 0.27	$ 1.53	$ 1.77
Diluted		$ (0.11)	$ 0.22	$ 1.46	$ 1.48
Comprehensive income (loss)		$ 2,149	$ (8,523)	$ 59,836	$ 68,016
Comprehensive income (loss) attributable to Iconix Brand Group, Inc.		(2,284)	(12,050)	46,501	57,851
Comprehensive income (loss)		2,149	(8,523)	59,836	68,016
Comprehensive income (loss) attributable to Iconix Brand Group, Inc.		(2,284)	(12,050)	46,501	57,851
As Previously Reported
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Licensing revenue		88,935	91,612	278,955	299,334
Other revenue	[1]		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		23,175	63,414	125,329	199,527
Other expenses (income) - net	[2]	20,475	16,441	(2,069)	11,071
Income before income 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
Less: Net income attributable to non-controlling interest		3,367	3,433	11,037	9,970
Net (loss) income attributable to Iconix Brand Group, Inc.		$ (6,340)	$ 33,684	$ 72,129	$ 124,564
Earnings (loss) per share:
Basic		$ (0.13)	$ 0.70	$ 1.50	$ 2.56
Diluted		$ (0.13)	$ 0.58	$ 1.43	$ 2.14
Comprehensive income (loss)		$ 1,077	$ 10,643	$ 56,399	$ 105,440
Comprehensive income (loss) attributable to Iconix Brand Group, Inc.		(2,290)	7,210	45,362	95,470
Comprehensive income (loss)		1,077	10,643	56,399	105,440
Comprehensive income (loss) attributable to Iconix Brand Group, Inc.		(2,290)	7,210	45,362	95,470
Adjustments
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Licensing revenue		2,397	(1,647)	5,589	(3,853)
Other revenue	[1]		(18,680)		(38,690)
Total revenue		2,397	(20,327)	5,589	(42,543)
Selling, general and administrative expenses		(1,860)	(51)	(1,665)	(84)
Gains on sale of trademarks	[1]				(6,399)
Equity earnings on joint ventures	[2]	(350)	(2,639)	(3,000)	(8,683)
Operating income		4,607	(17,637)	10,254	(27,377)
Other expenses (income) - net	[2]	1,986	4,087	5,523	21,637
Income before income taxes		2,621	(21,724)	4,731	(49,014)
Provision for income taxes		602	(989)	851	(10,844)
Net (loss) income		2,019	(20,735)	3,880	(38,170)
Less: Net income attributable to non-controlling interest		1,066	94	2,298	195
Net (loss) income attributable to Iconix Brand Group, Inc.		$ 953	$ (20,829)	$ 1,582	$ (38,365)
Earnings (loss) per share:
Basic		$ 0.02	$ (0.43)	$ 0.03	$ (0.79)
Diluted		$ 0.02	$ (0.36)	$ 0.03	$ (0.66)
Comprehensive income (loss)		$ 1,072	$ (19,166)	$ 3,437	$ (37,424)
Comprehensive income (loss) attributable to Iconix Brand Group, Inc.		6	(19,260)	1,139	(37,619)
Comprehensive income (loss)		1,072	(19,166)	3,437	(37,424)
Comprehensive income (loss) attributable to Iconix Brand Group, Inc.		$ 6	$ (19,260)	$ 1,139	$ (37,619)

[1] 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.

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