Acquisition of Brands (Detail)	12 Months Ended
	Dec. 31, 2017
Strawberry Shortcake
Business Acquisition [Line Items]
Date Acquired	2015-03
Brand	Strawberry Shortcake
US PONY Holdings, LLC
Business Acquisition [Line Items]
Date Acquired	2015-02
Brand	PONY
Iconix’s Investment	75.00%