Schedule of Gains on Sale of Trademarks, Net (Detail) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Net gains (losses) on sale of trademarks		$ 875	$ 1,268	$ 875
Sharper Image Trademark | Iconix Canada
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Net gains (losses) on sale of trademarks	[1]	500		500
Sharper Image Trademark | Iconix Southeast Asia
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Net gains (losses) on sale of trademarks	[2]		236
Sharper Image Trademark | Iconix Europe LLC
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Net gains (losses) on sale of trademarks	[2]		352
Sharper Image Trademark | Iconix MENA
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Net gains (losses) on sale of trademarks	[2]		250
Sharper Image Trademark | Iconix Australia
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Net gains (losses) on sale of trademarks	[2]		125
Badgley Mischka Trademark | Iconix Canada
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Net gains (losses) on sale of trademarks	[3]	$ 375		$ 375
Badgley Mischka Trademark | Iconix Southeast Asia
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Net gains (losses) on sale of trademarks	[4]		478
Badgley Mischka Trademark | Iconix Europe LLC
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Net gains (losses) on sale of trademarks	[4]		(244)
Badgley Mischka Trademark | Iconix MENA
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Net gains (losses) on sale of trademarks	[4]		$ 71

[1] In September 2017, the Company sold its interest in the Sharper Image trademark in Canada for $0.5 million in cash. The Company recognized a gain of $0.5 million as a result of this transaction.

[2] In December 2016, the Company sold its rights to the Sharper Image intellectual property and related assets to 360 Holdings, Inc. The Sharper Image intellectual property and related assets within other foreign territories, which was owned by certain of the Company’s joint venture entities, required the Company to negotiate and finalize the sale of the intellectual property with its respective joint venture partners. As a result, in the Current Nine Months, the Company recognized an additional combined gain of approximately $1.0 million upon final execution of the agreement for the sale of the Sharper Image intellectual property and related assets which were previously owned by the Iconix Southeast Asia, Iconix Europe, Iconix MENA and Iconix Australia joint ventures.

[3] In September 2017, the Company sold its interest in certain Badgley Mischka trademarks for shoes and handbags in Canada for $0.4 million in cash. The Company recognized a gain of $0.4 million as a result of this transaction

[4] In February 2016, the Company sold its rights to the Badgley Mischka intellectual property and related assets to Titan Industries, Inc. in partnership with the founders, Mark Badgley and James Mischka, and the apparel license MJCLK LLC. The Badgley Mischka intellectual property and related assets within other foreign territories, which was owned by certain of the Company’s joint venture entities, required the Company to negotiate and finalize the sale of the intellectual property with its respective joint venture partners. As a result, in the Current Nine Months, the Company recognized an additional combined net gain of approximately $0.3 million upon final execution of the agreement for the sale of the Badgley Mischka intellectual property and related assets which were previously owned by the Iconix Southeast Asia, Iconix Europe and Iconix MENA joint ventures.