Schedule of Gains on Sale of Trademarks, net (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Total net gains (losses) on sales of trademarks	$ 1,268
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]
Total net gains (losses) on sales of trademarks	236	[1]
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]
Total net gains (losses) on sales of trademarks	352	[1]
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]
Total net gains (losses) on sales of trademarks	250	[1]
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]
Total net gains (losses) on sales of trademarks	125	[1]
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]
Total net gains (losses) on sales of trademarks	478	[2]
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]
Total net gains (losses) on sales of trademarks	(244)	[2]
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]
Total net gains (losses) on sales of trademarks	$ 71	[2]

[1] In December 2016, the Company sold the rights to the Sharper Image intellectual property and related assets to 360 Holdings, Inc. for $100.0 million in cash (of which $1.8 million is being held in escrow for the sale of the Sharper Image intellectual property in the Company’s international joint ventures). The Company recognized a gain of $28.1 million as a result of this transaction. The Sharper Image intellectual property and related assets within other foreign territories is owned by certain of the Company’s joint venture entities and required the Company to negotiate and finalize the sale of the intellectual property with its respective joint venture partners. 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. In FY 2018, 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 resulting in an aggregate gain on the sale of the brand of $29.6 million.

[2] 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 for $13.8 million in cash. The Company recognized a gain of $11.6 million as a result of this transaction. The $11.6 million gain represented the sale of the Badgley Mischka intellectual property and related assets within the United States, Greater China, Israel and Latin America territories. The Badgley Mischka intellectual property and related assets within other foreign territories is owned by certain of the Company’s joint venture entities and required the Company to negotiate and finalize the sale of the intellectual property with its respective joint venture partners. 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. Additionally, in FY 2018, the Company recognized an additional combined 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 resulting in an aggregate gain on the sale of the brand of $12.3 million.