Unaudited Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income from continuing operations	$ (580,813)	$ 17,065	$ (583,564)	$ 49,209
Other comprehensive income (loss):
Foreign currency translation gain (loss)	6,353	3,000	20,900	7,955
Change in fair value of available for sale securities	46	47	(625)	(2,179)
Total other comprehensive income	6,399	3,047	20,275	5,776
Comprehensive (loss) income	(574,414)	20,112	(563,289)	54,985
Less: comprehensive income attributable to non-controlling interest from continuing operations	(30,242)	2,885	(23,857)	9,802
Comprehensive (loss) income from continuing operations attributable to Iconix Brand Group, Inc.	$ (544,172)	$ 17,227	$ (539,432)	$ 45,183