Consolidated Financial Information (Parenthetical) (Detail) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended							6 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2014	Oct. 31, 2013	Sep. 30, 2013	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information [Line Items]
Non-cash pre-tax re-measurement gain							$ 37,893				$ 37,893		$ 37,893		$ 37,893
Gain on sale of assets							3,971				20,009	$ 9,769	38,690	$ 17,809	45,840	$ 32,579	$ 12,133
LC Partners U.S. LLC
Quarterly Financial Information [Line Items]
Net gain recognized on sale of interest in subsidiary							4,000
Iconix Southeast Asia
Quarterly Financial Information [Line Items]
Gain on sale of interest in subsidiary		$ 2,700			$ 18,700	$ 8,300		$ 2,700							8,300	2,700
Iconix Middle East
Quarterly Financial Information [Line Items]
Gain on sale of interest in subsidiary				$ 7,200											$ 7,200
Iconix Latin America
Quarterly Financial Information [Line Items]
Non-cash pre-tax re-measurement gain	$ 37,893						37,893
Iconix Canada
Quarterly Financial Information [Line Items]
Net gain recognized on sale of interest in subsidiary							$ 9,800			$ 9,800	$ 9,800		$ 9,800			$ 9,800
Iconix Australia
Quarterly Financial Information [Line Items]
Gain on sale of interest in subsidiary			$ 5,100						$ 5,100
Iconix Israel
Quarterly Financial Information [Line Items]
Net gain recognized on sale of interest in subsidiary								2,300
Trademarks | Sharper Image
Quarterly Financial Information [Line Items]
Net gain recognized on sale of interest in subsidiary						$ 7,800
Korea | Trademarks | Umbro
Quarterly Financial Information [Line Items]
Gain on sale of assets								$ 10,000