Trademarks and Other Intangibles, net - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended				1 Months Ended		1 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014 Trademarks	Sep. 30, 2014 Trademarks Iconix Southeast Asia	Jun. 30, 2014 Trademarks Iconix Southeast Asia	Jan. 31, 2014 Iconix Europe	Jan. 31, 2014 Iconix Europe Trademarks	Feb. 28, 2014 Iconix Latin America	Feb. 28, 2014 Iconix Latin America Trademarks
Intangible Assets by Major Class [Line Items]
Increase (Decrease) in indefinite-lived trademarks						$ (5,200,000)	$ (3,600,000)
Sale of indefinite-lived trademarks					2,200,000
Controlling interest								1.00%		50.00%
Interest acquired, including previously acquired interest								51.00%		100.00%
Increase in value of indefinite-lived intangible assets									27,000,000		82,400,000
Amortization expense for intangible assets	900,000	2,000,000	3,392,000	5,765,000
Impairment of intangible assets, indefinite-lived			0	0
Impairment of intangible assets, finite-lived			$ 0	$ 0