Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (2,976)	$ (99,925)
Other comprehensive income (loss):
Foreign currency translation income (loss)	12,018	(1,575)
Total other comprehensive income (loss)	12,018	(1,575)
Comprehensive income (loss)	9,042	(101,500)
Less: comprehensive income attributable to non-controlling interest	4,360	9,597
Comprehensive income (loss) attributable to Iconix Brand Group, Inc.	$ 4,682	$ (111,097)