Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (101,916)	$ (89,669)
Other comprehensive income (loss):
Foreign currency translation (loss) gain	(1,575)	(4,965)
Total other comprehensive (loss) income	(1,575)	(4,965)
Comprehensive loss	(103,491)	(94,634)
Less: comprehensive income (loss) attributable to non-controlling interest	9,597	10,852
Comprehensive loss attributable to Iconix Brand Group, Inc.	$ (113,088)	$ (105,486)