Joint Ventures and Investments - Equity Method Investments (Parenthetical) (Detail) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended
	Apr. 30, 2016	Jun. 30, 2017	Jun. 30, 2017
Schedule Of Equity Method Investments [Line Items]
Pre-tax gain on deconsolidation of entity		$ 3,772,000	$ 3,772,000
Galore Media, Inc.
Schedule Of Equity Method Investments [Line Items]
Maximum marketing service agreed to be purchased in FY 2016	$ 500,000
Equity ownership percentage	11.00%
Galore Media, Inc. | Series A Preferred Stock
Schedule Of Equity Method Investments [Line Items]
Shares purchased	50,050
Shares purchased, value	$ 500,000
Preferred Stock, Participation Rights			The Series A Preferred Stock carries voting rights, and the holders of the Series A Preferred Stock have the collective right to appoint one of five members of the Board of Directors of Galore as long as there are at least 48,000 Series A Preferred Shares outstanding.
Minimum number of preferred shares outstanding for holders to have collective right to appoint one of five members of board of directors	48,000
Iconix SE Asia, Ltd.
Schedule Of Equity Method Investments [Line Items]
Pre-tax gain on deconsolidation of entity			$ 3,800,000
Iconix SE Asia, Ltd. | Level 3
Schedule Of Equity Method Investments [Line Items]
Equity-method investment at fair value		$ 17,400,000	$ 17,400,000