Goodwill and Trademarks and Other Intangibles, net - Additional Information (Detail) - USD ($)	1 Months Ended			3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Intangible Assets by Major Class [Line Items]
Non-cash goodwill impairment charge							$ 0	$ 0
Changes in goodwill	$ (53,000,000)
Impairment of intangible assets, indefinite-lived				$ 0		$ 0
Impairment of intangible assets, finite-lived							0	0
Amortization expense for intangible assets				200,000		$ 500,000	$ 392,000	$ 1,095,000
Minimum | Non-compete agreements and contracts
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, useful life							1 year
Maximum | Non-compete agreements and contracts
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, useful life							15 years
Iconix SE Asia, Ltd.
Intangible Assets by Major Class [Line Items]
Increase (Decrease) in indefinite-lived trademarks	(22,700,000)
Trademarks
Intangible Assets by Major Class [Line Items]
Increase (Decrease) in indefinite-lived trademarks	(204,300,000)
Residual value	0			0			$ 0
Trademarks | Minimum
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, useful life							10 years
Residual value	0			0			$ 0
Trademarks | Maximum
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, useful life							15 years
Residual value	0			$ 0			$ 0
Trademarks | Assets Held for Sale
Intangible Assets by Major Class [Line Items]
Increase (Decrease) in indefinite-lived trademarks									$ (204,300,000)
Trademarks | Peanuts Holdings, LLC
Intangible Assets by Major Class [Line Items]
Increase (Decrease) in indefinite-lived trademarks	(153,600,000)
Trademarks | Peanuts Holdings, LLC | Assets Held for Sale
Intangible Assets by Major Class [Line Items]
Increase (Decrease) in indefinite-lived trademarks									(153,600,000)
Trademarks | Strawberry Shortcake
Intangible Assets by Major Class [Line Items]
Increase (Decrease) in indefinite-lived trademarks	(50,700,000)
Trademarks | Strawberry Shortcake | Assets Held for Sale
Intangible Assets by Major Class [Line Items]
Increase (Decrease) in indefinite-lived trademarks									$ (50,700,000)
Trademarks | Sharper Image intellectual property and related assets
Intangible Assets by Major Class [Line Items]
Increase (Decrease) in indefinite-lived trademarks		$ (55,600,000)
Trademarks | London Fog Korea trademark
Intangible Assets by Major Class [Line Items]
Increase (Decrease) in indefinite-lived trademarks			$ (400,000)
Operating Segments | Trademarks
Intangible Assets by Major Class [Line Items]
Impairment of intangible assets, indefinite-lived					$ 424,900,000
Iconix SE Asia, Ltd. | Global Brand Group Asia, Ltd.
Intangible Assets by Major Class [Line Items]
Changes in goodwill	$ (3,500,000)
Men's
Intangible Assets by Major Class [Line Items]
Non-cash goodwill impairment charge					18,300,000
Men's | Operating Segments | Trademarks
Intangible Assets by Major Class [Line Items]
Impairment of intangible assets, indefinite-lived					144,600,000
Women's
Intangible Assets by Major Class [Line Items]
Non-cash goodwill impairment charge					0
Women's | Operating Segments | Trademarks
Intangible Assets by Major Class [Line Items]
Impairment of intangible assets, indefinite-lived					31,500,000
Home
Intangible Assets by Major Class [Line Items]
Non-cash goodwill impairment charge					0
Home | Operating Segments | Trademarks
Intangible Assets by Major Class [Line Items]
Impairment of intangible assets, indefinite-lived					50,000,000
Entertainment
Intangible Assets by Major Class [Line Items]
Non-cash goodwill impairment charge					0
Entertainment | Operating Segments | Trademarks
Intangible Assets by Major Class [Line Items]
Impairment of intangible assets, indefinite-lived					5,100,000
International | Operating Segments | Trademarks
Intangible Assets by Major Class [Line Items]
Impairment of intangible assets, indefinite-lived					$ 193,700,000