Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 37,117	$ 34,625	$ 62,792	$ 30,504	$ 42,015	$ 39,274	$ 97,417	$ 81,289	$ 134,534	$ 111,793	$ 163,536	$ 142,587	$ 123,509
Other comprehensive income (loss):
Foreign currency translation (loss) gain	(26,524)	(2,332)	(288)	12,200	4,239	(11,434)	(2,620)	(7,195)	(29,144)	5,005	(40,672)	16,486
Change in fair value of cash flow hedge													483
Unrealized gain on investments	50								50
Total other comprehensive income (loss)	(26,474)	(2,332)	(288)	12,200	4,239	(11,434)	(2,620)	(7,195)	(29,094)	5,005	(40,672)	16,486	483
Comprehensive income	10,643	32,293	62,504	42,704	46,254	27,840	94,797	74,094	105,440	116,798	122,864	159,073	123,992
Less: comprehensive income attributable to non-controlling interest	3,433	3,463	3,074	1,507	3,299	5,085	6,537	8,384	9,970	9,891	14,693	14,539	14,101
Comprehensive income attributable to Iconix Brand Group, Inc.	$ 7,210	$ 28,830	$ 59,430	$ 41,197	$ 42,955	$ 22,755	$ 88,260	$ 65,710	$ 95,470	$ 106,907	$ 108,171	$ 144,534	$ 109,891