Joint Ventures and Investments - Amounts Due from Such Joint Venture Partners Remain Recorded on Consolidated Balance Sheet (Detail) - Iconix India $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Schedule Of Investments [Line Items]
Joint Venture Partner	Reliance Brands Ltd.	[1]
Other Assets - Current
Schedule Of Investments [Line Items]
Joint Venture Partner	Reliance Brands Ltd.
Amount	$ 1,000

[1] The Company determined, in accordance with ASC 810, based on the corporate structure, voting rights and contributions of the Company and its respective joint venture partner, that the joint venture is not a VIE and not subject to consolidation. The Company has recorded its investment under the equity method of accounting since inception.