Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 62,792	$ 39,274	$ 97,417	$ 81,289	$ 134,534	$ 111,793	$ 163,536	$ 142,587	$ 123,509
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	695	615	1,404	1,241	2,154	1,897	2,605	2,702	2,784
Amortization of trademarks and other intangibles	1,495	1,874	2,468	3,781	3,392	5,765	4,530	7,428	5,528
Amortization of deferred financing costs	1,403	832	2,711	1,727	3,997	2,898	5,263	4,816	3,263
Amortization of convertible note discount	7,078	3,614	14,428	10,537	22,041	17,705	29,616	24,838	20,098
Stock-based compensation expense	2,515	1,895	8,247	7,931	14,726	12,528	18,492	20,018	11,492
Non-cash gain on re-measurement of equity investment	(37,893)		(37,893)		(37,893)		(37,893)
Provision for doubtful accounts	1,000	1,100	1,956	2,140	5,530	4,968	9,627	9,718	5,362
Earnings on equity investments in joint ventures	(3,122)	(1,936)	(8,797)	(4,200)	(12,881)	(7,588)	(17,030)	(12,129)	(10,887)
Distributions from equity investments	997	2,102	4,767	3,034	6,303	4,217	7,145	13,116	2,265
Gain on sale of securities				(5,395)	(125)	(5,395)	(342)	(5,395)
Gain on sale of trademarks	(3,971)		(20,009)	(9,769)	(38,690)	(17,809)	(45,840)	(32,579)	(12,133)
Deferred income tax provision	19,705	7,001	25,644	8,412	29,893	15,246	43,474	31,416	24,385
Changes in operating assets and liabilities, net of business acquisitions:
Accounts receivable	(8,918)	(27,233)	(21,509)	(20,403)	(35,530)	(8,186)	(22,822)	3,730	(10,942)
Other assets - current	4,001	(1,484)	6,239	(3,145)	31,558	(639)	(14,449)	(4,491)	20,513
Other assets	(7,766)	1,866	(2,581)	7,584	(30,034)	942	(5,719)	(9,132)	11,889
Deferred revenue	5,694	13,981	433	18,968	216	13,722	(7,414)	6,102	(3,745)
Accounts payable and accrued expenses	7,040	12,111	9,306	(1,780)	25,255	8,154	29,742	407	13,543
Net cash provided by operating activities	52,745	55,612	84,231	101,952	124,445	160,218	162,521	203,152	206,924
Cash flows used in investing activities:
Purchases of property and equipment	(315)	(117)	(851)	(668)	(1,086)	(1,046)	(1,505)	(1,209)	(1,595)
Purchase of securities					(5,998)		(5,998)
Gain on sale of securities				5,395	720	5,395	6,341	5,395
Additional investments in joint ventures	(22)	(37)	(2,500)	(37)	(2,500)	(373)		(744)	(6,870)
Earn-out payment on acquisitions									(3,771)
Proceeds from sale of trademarks	995	7,300	9,168	16,141	14,730	23,361	24,915	41,866	2,000
Additions to trademarks	(213)	(81)	(295)	(126)	(790)	(344)	(915)	(8,372)	(633)
Net cash used in investing activities	(41,555)	(136,102)	(36,478)	(167,462)	(36,924)	(226,294)	(33,662)	(163,351)	(244,869)
Cash flows (used in) provided by financing activities:
Shares repurchased on the open market	(109,422)	(158,922)	(144,312)	(302,764)	(168,168)	(406,333)	(193,434)	(436,419)	(125,341)
Proceeds from long-term debt		392,000		662,188		662,188		392,000	750,000
Proceeds from sale of warrants		57,707		57,707		57,707		57,707
Payment for purchase of convertible note hedge		(84,106)		(84,106)		(84,106)		(84,106)
Payment of long-term debt	(15,313)	(2,500)	(30,624)	(67,500)	(47,574)	(79,800)	(62,856)	(95,113)	(491,765)
Deferred financing costs		(113)		(3,839)		(3,839)		(3,838)	(20,941)
Acquisition of equity method investments				(3,000)		(3,000)
Distributions to non-controlling interest holders	(4,023)	(212)	(8,445)	(4,294)	(10,110)	(4,440)	(11,648)	(8,290)	(9,039)
Payment of note payable to Purim								(3,000)
Excess tax benefit from share-based payment arrangements	898		1,172		1,480		10,706	1,193	1,495
Cost of shares repurchased on vesting of restricted stock and exercise of stock options	(13,571)	(2,086)	(13,971)	(2,488)	(13,696)	(2,737)	(16,024)	(3,707)	(1,195)
Proceeds from exercise of stock options and warrants	1,861	122	3,440	122	3,512	328	10,088	353	757
Proceeds from Securitization								270,188
Restricted cash	1,600	(45,172)	(1,696)	(31,406)	1,708	(29,998)	(9,163)	(42,496)	4,929
Net cash provided by (used in) financing activities	(137,970)	156,718	(194,436)	220,620	(232,848)	105,970	(272,331)	(528)	108,900
Effect of exchange rate changes on cash	90	(161)	(242)	(468)	(3,936)	807	(7,298)	844
Net (decrease) increase in cash and cash equivalents	(126,690)	76,067	(146,925)	154,642	(149,263)	40,701	(150,770)	40,117	70,955
Cash and cash equivalents, beginning of period	278,789	238,672	278,789	238,672	278,789	238,672	278,789	238,672	167,717
Cash and cash equivalents, end of period	152,099	314,739	131,864	393,314	129,526	279,373	128,019	278,789	238,672
Cash paid during the period:
Income taxes	7	3,740	3,508	16,022	3,508	16,478	3,508	20,054	14,847
Interest	11,931	1,093	24,448	16,999	36,051	27,439	48,224	40,410	16,043
Non-cash investing activities:
Sale of trademarks for note receivable			4,516	7,294	39,339	8,919	51,246	15,763	4,000
Non-cash financing activities:
Shares repurchased on the open market included in payable					3,459		3,156
Acquisitions:
Common stock issued									2,221
Buffalo Brand
Cash flows used in investing activities:
Acquisition of interest		(76,500)		(76,500)		(76,500)		(76,500)
Lee Cooper
Cash flows used in investing activities:
Acquisition of interest		$ (66,667)		(66,667)		(66,667)		(66,667)
Complex Media Inc.
Cash flows used in investing activities:
Acquisition of interest						(25,120)		(25,120)
Marcy Media Holdings
Cash flows used in investing activities:
Acquisition of interest						(32,000)		(32,000)
Latin America
Cash flows used in investing activities:
Acquisition of interest							(42,000)
MG Icon
Cash flows used in investing activities:
Acquisition of interest									(4,000)
Cash flows (used in) provided by financing activities:
Acquisition of equity method investments	(11,000)
NGX LLC
Cash flows used in investing activities:
Acquisition of interest							(6,000)
Hydraulic IP Holdings
Cash flows used in investing activities:
Acquisition of interest							(6,000)
iBrands
Cash flows used in investing activities:
Acquisition of interest							$ (2,500)
Umbro
Cash flows used in investing activities:
Acquisition of interest									(225,000)
Modern Amusement
Cash flows used in investing activities:
Acquisition of interest									$ (5,000)
IPH Unltd
Cash flows used in investing activities:
Acquisition of interest				$ (45,000)		(45,000)
Cash flows (used in) provided by financing activities:
Acquisition of equity method investments								$ (45,000)
Iconix Latin America
Cash flows used in investing activities:
Acquisition of interest	$ (42,000)		$ (42,000)		$ (42,000)
Rocawear Diffusion Brand
Cash flows used in investing activities:
Additions to trademarks						$ (8,000)