Acquisitions, Joint Ventures and Investments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			1 Months Ended	12 Months Ended				1 Months Ended		0 Months Ended		1 Months Ended		9 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended			0 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended									1 Months Ended			9 Months Ended	12 Months Ended						1 Months Ended		1 Months Ended			3 Months Ended	9 Months Ended			1 Months Ended	0 Months Ended		1 Months Ended					0 Months Ended		0 Months Ended				1 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Nov. 30, 2013 Iconix Israel	Dec. 31, 2013 Iconix Israel	Sep. 30, 2014 Iconix Israel	Sep. 30, 2014 Iconix Israel Other assets - current	Sep. 30, 2014 Iconix Israel Other Assets	Feb. 28, 2013 Lee Cooper	Feb. 28, 2013 Alberta ULC	Jul. 27, 2011 Zoo York brand	Jul. 27, 2011 Zoo York brand	Jul. 31, 2013 Marcy Media	Jul. 31, 2013 Rocawear Diffusion Brand	Sep. 30, 2013 Rocawear Diffusion Brand	Sep. 30, 2013 Complex Media Inc.	Mar. 31, 2014 LC Partners U.S. LLC Installment	Sep. 30, 2014 LC Partners U.S. LLC	Sep. 30, 2014 LC Partners U.S. LLC Other assets - current	Sep. 30, 2014 LC Partners U.S. LLC Other Assets	Dec. 29, 2008 Iconix Latin America	Feb. 28, 2014 Iconix Latin America	Sep. 30, 2014 Iconix Latin America	Dec. 31, 2013 Iconix Latin America	Dec. 31, 2011 Iconix Latin America	Dec. 29, 2008 Iconix Latin America	Dec. 31, 2013 Iconix Latin America Other assets - current	Dec. 31, 2013 Iconix Latin America Other Assets	Sep. 30, 2014 Iconix Latin America Current Asset	Sep. 30, 2014 Iconix Latin America Noncurrent Assets	Sep. 30, 2014 Iconix Latin America Current Liabilities	Sep. 30, 2014 Iconix Latin America Liabilities, Total	Jan. 31, 2014 Iconix Europe	Jan. 31, 2011 Iconix Europe	Dec. 31, 2009 Iconix Europe	Sep. 30, 2014 Iconix Europe	Dec. 31, 2009 Iconix Europe	Dec. 31, 2009 Iconix Europe Minimum	Sep. 30, 2014 Iconix Europe Current Asset	Sep. 30, 2014 Iconix Europe Noncurrent Assets	Sep. 30, 2014 Iconix Europe Current Liabilities	Sep. 30, 2014 Iconix Europe Liabilities, Total	Jun. 30, 2013 Buffalo Brand	Feb. 28, 2013 Buffalo Brand Alberta ULC	Sep. 30, 2014 Iconix Southeast Asia	Jun. 30, 2014 Iconix Southeast Asia	Oct. 31, 2013 Iconix Southeast Asia	Sep. 30, 2014 Iconix Southeast Asia	Sep. 30, 2014 Iconix Southeast Asia	Sep. 30, 2014 Iconix Southeast Asia Other assets - current	Sep. 30, 2014 Iconix Southeast Asia Other Assets	Sep. 30, 2013 Iconix Australia	May 30, 2013 IPH Unltd	May 17, 2013 IPH Unltd	Oct. 31, 2009 IPH Unltd	May 30, 2013 IPH Unltd	May 17, 2013 IPH Unltd	May 17, 2013 IPH Unltd Minimum	May 17, 2013 IPH Unltd Maximum	Jun. 03, 2010 Icon Entertainment LLC Peanuts Worldwide	Jun. 03, 2010 Icon Entertainment LLC Peanuts Worldwide	Jun. 03, 2010 Beagle Scout LLC Peanuts Worldwide	Jun. 03, 2010 Beagle Scout LLC Peanuts Worldwide	Sep. 30, 2014 Beagle Scout LLC Peanuts Worldwide Other assets - current	Jul. 31, 2013 Roc Nation LLC Marcy Media	Jun. 30, 2013 Iconix Canada	Sep. 30, 2014 Iconix Canada	Sep. 30, 2014 Iconix Canada Other assets - current	Sep. 30, 2014 Iconix Canada Other Assets
Schedule of Investments [Line Items]
Percentage of interest sold in equity method investment						50.00%													50.00%									50.00%									50.00%		50.00%										50.00%					50.00%														50.00%
Agreed price for sale of interest in a subsidiary																			$ 4,000,000								$ 5,700,000	$ 6,000,000									$ 4,000,000		$ 4,000,000								$ 21,500,000	$ 15,900,000		$ 21,500,000	$ 21,500,000																	$ 17,800,000
Payment received upon sale interest in subsidiary						1,000,000														800,000			1,000,000												1,500,000	1,000,000	3,000,000										4,300,000	4,000,000	7,500,000																			8,900,000
Receivable for investments sold						2,300,000		1,800,000	800,000	1,000,000									3,200,000	3,200,000	800,000	2,400,000				1,700,000		5,000,000	1,200,000	500,000																	35,600,000		4,500,000	35,600,000	35,600,000	15,300,000	20,300,000															8,900,000	8,200,000	3,000,000	5,200,000
Committed amount receivable period						36 months																	30 months																										24 months																			5 years
Period for revenue recognition																										3 years
Business acquisition purchase price, cash paid											66,700,000	76,500,000	18,000,000											42,000,000																																						172,100,000
Controlling interest												51.00%		100.00%										50.00%											1.00%																							51.00%		51.00%	100.00%		80.00%
Interest acquired, including previously acquired interest																								100.00%											51.00%
Non-cash pre-tax re-measurement gain			37,893,000																					37,893,000
Goodwill	231,855,000		231,855,000		230,976,000																			1,130,000
Impact of consolidating joint venture on condensed consolidated balance sheet																															9,200,000	84,300,000	1,600,000	1,600,000							2,000,000	27,000,000	900,000	900,000
Licensing and other revenue	113,750,000	107,175,000	348,831,000	327,362,000																					5,400,000													2,000,000
Operating income	63,560,000	61,470,000	206,146,000	199,220,000																					4,600,000													100,000
Business acquisition total purchase price											72,700,000
Business acquisition, assumed liabilities											6,000,000
Gain on sale of interest in subsidiary							2,300,000																																7,000,000										4,700,000	18,700,000	13,600,000			5,100,000
Preferred profit distribution to the Company																																			3,000,000					6,000,000
Gain on recognized in business acquisition																																			1,500,000
Accretion period of difference between fair value of call option and non-controlling interest at inception																																			5 years
Number of equal annual installments																			4
Net gain recognized on sale of interest in subsidiary																				4,000,000																																																	9,800,000
Percentage of minority interest in subsidiary															10.00%			14.40%																												49.00%											49.00%		49.00%						20.00%
Price for sale of interest in a subsidiary						3,300,000																																											12,000,000					7,200,000
Percentage of equity interest subject to call option						5.00%																																							5.00%				5.00%					5.00%
Additional amount receivable up on achievement revenue targets																																																	2,000,000
Cash payment for acquisition of assets			2,500,000	373,000											32,000,000			25,000,000																																						45,000,000	63,500,000					141,000,000		34,000,000
Percentage of interest in joint venture after transaction																																																									51.00%
Indebtedness of joint venture																																																									90,000,000
Payments for holders of a promissory notes																																																							52,700,000
Notes loaned to subsidiary																																																																	17,500,000	2,400,000
Notes receivable, annual interest rate																																																																	6.00%
Notes receivable, minimum principal annual installments																																																																	2,200,000
Notes receivable, maturity date																																																																Jun. 03, 2015
Percentage ownership interest																																																																			50.00%
Acquisition of trademarks			$ 790,000	$ 344,000												$ 8,000,000	$ 8,000,000