Unaudited Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 6,939	$ (21,001)
Other comprehensive loss:
Foreign currency translation loss	(6,457)	(2,369)
Total other comprehensive loss	(6,457)	(2,369)
Comprehensive income (loss)	482	(23,370)
Less: comprehensive income attributable to non-controlling interest	2,751	825
Comprehensive loss attributable to Iconix Brand Group, Inc.	$ (2,269)	$ (24,195)