Unaudited Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (20,658)	$ 21,306
Other comprehensive (loss) income:
Foreign currency translation loss	(2,369)	(1,724)
Total other comprehensive (loss) income	(2,369)	(1,724)
Comprehensive income (loss)	(23,027)	19,582
Less: comprehensive income attributable to non-controlling interest	825	3,361
Comprehensive income (loss) attributable to Iconix Brand Group, Inc.	$ (23,852)	$ 16,221