Net Revenues by Type of License and Information by Geographic Region (Detail) - USD ($) $ in Thousands		3 Months Ended																12 Months Ended
		Dec. 31, 2015	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2014	[2]	Sep. 30, 2014	[2]	Jun. 30, 2014	[2]	Mar. 31, 2014	[2]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Licensing revenue		$ 94,653		$ 91,332		$ 97,398		$ 95,814		$ 96,009		$ 89,965		$ 95,116		$ 110,400		$ 379,197	$ 391,490	$ 390,574
Licensing revenue																		379,197	391,490	390,574
Operating income (loss)		$ (398,245)		$ 27,781		$ 51,825		$ 55,976		$ 48,280		$ 45,777		$ 61,860		$ 64,511		(262,663)	220,428	234,978
United States
Segment Reporting Information [Line Items]
Licensing revenue																		250,209	264,022	265,433
Japan
Segment Reporting Information [Line Items]
Licensing revenue																		34,640	31,048	29,734
Other
Segment Reporting Information [Line Items]
Licensing revenue	[3]																	94,348	96,420	95,407
Operating Segments | Men's
Segment Reporting Information [Line Items]
Licensing revenue																		92,181	103,903	146,242
Operating income (loss)																		(351,448)	58,517	101,743
Operating Segments | Women's
Segment Reporting Information [Line Items]
Licensing revenue																		139,300	141,348	128,022
Operating income (loss)																		112,963	126,855	117,168
Operating Segments | Home
Segment Reporting Information [Line Items]
Licensing revenue																		40,110	43,169	41,361
Operating income (loss)																		(6,543)	35,174	36,834
Operating Segments | Entertainment
Segment Reporting Information [Line Items]
Licensing revenue																		107,606	103,070	74,949
Operating income (loss)																		35,636	31,524	21,291
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)																		(53,271)	(31,642)	(42,058)
Direct To Retail License
Segment Reporting Information [Line Items]
Licensing revenue																		154,278	158,599	153,377
Wholesale License
Segment Reporting Information [Line Items]
Licensing revenue																		170,705	178,890	214,289
Other Licenses
Segment Reporting Information [Line Items]
Licensing revenue																		$ 54,214	$ 54,001	$ 22,908

[1] FY 2015: Operating income (loss), net includes a non-cash impairment charge of $437.5 million primarily related to the men’s brands recorded in the fourth quarter. Included in net income (loss) attributable to Iconix Brand Group, Inc. is a non-cash pre-tax re-measurement gain of approximately $50.0 million related to the purchase of the remaining interest in Iconix China in the first quarter.

[2] FY 2014 (Restated): Operating income, net includes a net gain of $6.4 million on the sale of the “sharperimage.com” domain name and certain categories under the Sharper Image trademark in the second quarter. Included in net income attributable to Iconix Brand Group, Inc is a non-cash pre-tax re-measurement gain of approximately $34.7 million related to the purchase of the remaining interest in Iconix Latin America in the first quarter.

[3] No single country represented 10% of the Company’s revenues in the periods presented within “Other” on this table.