Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($)	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Net goodwill				$ 26,099,000	$ 63,882,000
Impairment	$ 0	$ 0	$ (37,800,000)	0	(37,812,000)
Net goodwill	26,099,000	26,099,000		26,099,000	26,099,000
Iconix Australia
Goodwill [Line Items]
Acquisition of 5% interest in Iconix Australia					29,000
Women's
Goodwill [Line Items]
Net goodwill					37,812,000
Impairment			$ (37,800,000)		(37,812,000)
International
Goodwill [Line Items]
Net goodwill				26,099,000	26,070,000
Net goodwill	$ 26,099,000	$ 26,099,000		$ 26,099,000	26,099,000
International | Iconix Australia
Goodwill [Line Items]
Acquisition of 5% interest in Iconix Australia					$ 29,000