Acquisitions, Investments and Joint Ventures - Additional Information (Detail)	3 Months Ended			3 Months Ended		1 Months Ended				1 Months Ended	9 Months Ended					3 Months Ended		1 Months Ended					3 Months Ended				3 Months Ended						1 Months Ended								1 Months Ended	3 Months Ended		1 Months Ended								1 Months Ended					1 Months Ended						1 Months Ended						1 Months Ended		12 Months Ended		1 Months Ended	3 Months Ended			3 Months Ended				1 Months Ended	12 Months Ended			3 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 Licensing agreements Minimum	Mar. 31, 2013 Licensing agreements Maximum	Apr. 26, 2011 Hardy Way USD ($)	Dec. 23, 2011 Hardy Way Nervous Tattoo, Inc. USD ($)	May 31, 2009 Hardy Way Equity method of accounting USD ($)	Jul. 27, 2011 Zoo York brand USD ($)	Mar. 31, 2010 MG Icon Equity method of accounting USD ($)	Sep. 30, 2012 MG Icon Equity method of accounting USD ($)	Mar. 31, 2013 MG Icon Equity method of accounting USD ($)	Mar. 31, 2012 MG Icon Equity method of accounting USD ($)	Mar. 31, 2012 MG Icon Equity method of accounting Period 1 USD ($)	Mar. 31, 2012 MG Icon Equity method of accounting Period 2 USD ($)	Mar. 31, 2013 MG Icon Equity method of accounting Minimum USD ($)	Jun. 03, 2010 Peanuts Worldwide USD ($)	Jun. 03, 2010 Peanuts Worldwide Licensing agreements Minimum	Jun. 03, 2010 Peanuts Worldwide Licensing agreements Maximum	Nov. 30, 2012 Umbro Limited USD ($)	Feb. 20, 2013 Lee Cooper USD ($)	Mar. 31, 2013 Lee Cooper USD ($)	Mar. 31, 2013 Lee Cooper Licensing agreements Minimum	Mar. 31, 2013 Lee Cooper Licensing agreements Maximum	Mar. 31, 2013 Alberta ULC USD ($)	Feb. 01, 2013 Alberta ULC USD ($)	Mar. 31, 2013 Alberta ULC Current Asset USD ($)	Mar. 31, 2013 Alberta ULC Noncurrent Assets USD ($)	Mar. 31, 2013 Alberta ULC Current Liabilities USD ($)	Mar. 31, 2013 Alberta ULC Liabilities, Total USD ($)	Mar. 31, 2013 Scion Cost method of accounting USD ($)	Dec. 31, 2012 Scion Cost method of accounting USD ($)	Jun. 30, 2010 Scion Cost method of accounting Variable Interest Entity, Not Primary Beneficiary USD ($)	Mar. 31, 2009 Scion Cost method of accounting Variable Interest Entity, Not Primary Beneficiary USD ($)	Mar. 31, 2013 Scion Cost method of accounting Variable Interest Entity, Not Primary Beneficiary USD ($)	Jan. 31, 2012 Scion Cost method of accounting Variable Interest Entity, Not Primary Beneficiary USD ($)	Dec. 31, 2011 Scion Cost method of accounting Variable Interest Entity, Not Primary Beneficiary USD ($)	Nov. 07, 2007 Scion Artful Dodger USD ($)	May 31, 2012 Scion BBC LLC Billionaire Boys ClubTM/BBCTM and Ice CreamTM USD ($)	Mar. 31, 2012 Scion BBC LLC Billionaire Boys ClubTM/BBCTM and Ice CreamTM USD ($)	Sep. 30, 2008 Parent Company Equity method of accounting USD ($)	Mar. 31, 2013 Parent Company Equity method of accounting USD ($)	Mar. 31, 2013 Parent Company Equity method of accounting INR	Jan. 31, 2013 Parent Company Cost method of accounting Variable Interest Entity, Not Primary Beneficiary USD ($)	Jan. 31, 2012 Parent Company Cost method of accounting Variable Interest Entity, Not Primary Beneficiary USD ($)	Mar. 31, 2009 Parent Company Cost method of accounting Variable Interest Entity, Not Primary Beneficiary USD ($)	Jun. 30, 2012 Novel Equity method of accounting USD ($)	May 31, 2011 Novel Equity method of accounting USD ($)	Jul. 31, 2010 Novel Equity method of accounting USD ($)	Sep. 30, 2008 Novel Equity method of accounting USD ($)	Sep. 30, 2009 Novel Equity method of accounting USD ($)	Dec. 29, 2008 Iconix Latin America Equity method of accounting USD ($)	Oct. 31, 2009 IPH Unltd USD ($)	Mar. 31, 2013 IPH Unltd USD ($)	Dec. 31, 2012 IPH Unltd USD ($)	Oct. 31, 2009 IPH Unltd Ecko Assets USD ($)	Oct. 31, 2009 IPH Unltd Ecko Assets Licensing agreements Minimum	Oct. 31, 2009 IPH Unltd Ecko Assets Licensing agreements Maximum	Jun. 03, 2010 Icon Entertainment LLC Peanuts Worldwide USD ($)	Jun. 03, 2010 Beagle Scout LLC Peanuts Worldwide USD ($)	Mar. 31, 2013 Beagle Scout LLC Peanuts Worldwide Other assets - current USD ($)	Mar. 31, 2013 Beagle Scout LLC Peanuts Worldwide Other assets USD ($)	Jan. 31, 2012 Scion Partner Cost method of accounting Variable Interest Entity, Not Primary Beneficiary USD ($)	Mar. 31, 2009 Scion Partner Cost method of accounting Variable Interest Entity, Not Primary Beneficiary USD ($)	Mar. 31, 2013 Latin America Territory USD ($)	Dec. 31, 2011 Latin America Territory USD ($)	Mar. 31, 2013 Latin America Territory Other assets - current USD ($)	Mar. 31, 2013 Latin America Territory Other assets USD ($)	Jan. 31, 2011 Iconix Europe Equity method of accounting USD ($)	Dec. 31, 2009 Iconix Europe Equity method of accounting USD ($)	Dec. 31, 2009 Iconix Europe Equity method of accounting USD ($)	Dec. 31, 2009 Iconix Europe Equity method of accounting Minimum USD ($)	May 31, 2012 Iconix Lifestyle India Equity method of accounting USD ($)	Mar. 31, 2013 Iconix Lifestyle India Equity method of accounting USD ($)	Mar. 31, 2013 Iconix Lifestyle India Equity method of accounting Other assets - current USD ($)	Mar. 31, 2013 Iconix Lifestyle India Equity method of accounting Other Assets USD ($)	Mar. 31, 2013 Reliance Brands Limited Equity method of accounting USD ($)	Mar. 31, 2013 Reliance Brands Limited Equity method of accounting INR	Dec. 27, 2012 Modern Amusement Equity method of accounting USD ($)	Dec. 27, 2012 Icon MA	Dec. 31, 2011 Iconix China USD ($)	Dec. 31, 2012 Iconix China USD ($)	Mar. 31, 2013 Buffalo Brand Alberta ULC USD ($)	Feb. 01, 2013 Buffalo Brand Alberta ULC	Mar. 31, 2013 Buffalo Brand Alberta ULC Licensing agreements Minimum	Mar. 31, 2013 Buffalo Brand Alberta ULC Licensing agreements Maximum
Schedule of Investments [Line Items]
Business acquisition total purchase price								$ 17,000,000	$ 18,000,000	$ 20,000,000										$ 225,000,000	$ 72,700,000					$ 150,000,000												$ 15,000,000	$ 3,500,000																																								$ 5,000,000
Goodwill deductible for income tax						18,800,000											17,700,000					1,100,000																																		700,000																											4,100,000
Amortization contractual period of licensing contracts				1 year	9 years													1 year	5 years				1 year	9 years																																	1 year	9 years																											1 year	5 years
Acquisition costs																					500,000
Controlling interest						85.00%		50.00%	100.00%	50.00%																51.00%								16.60%					50.00%																				80.00%																				51.00%
Business acquisition purchase price, cash paid								9,000,000													72,735,000					76,500,000																																	172,100,000
Percentage of minority interest in subsidiary																																																					49.00%							20.00%																				49.00%				49.00%
License agreement expenses																									1,000,000
Net income attributable to non controlling interest	5,085,000	3,280,000																							1,800,000
Impact of consolidating joint venture on condensed consolidated balance sheet																											4,200,000	149,900,000	400,000	400,000
Amount released from escrow account																				6,800,000
Percentage of interest sold in equity method investment																																																				50.00%																		50.00%	50.00%		50.00%
Price for sale of interest in a subsidiary																																																																									6,000,000
Payment received upon sale interest in subsidiary																																																				1,000,000																	1,000,000	3,000,000			2,000,000
Receivable for investments sold																																																				5,000,000													3,000,000		1,200,000	1,800,000					4,000,000	4,000,000	1,000,000	3,000,000
Committed amount receivable period																																																				30 months																					48 months
Net gain recognized on sale of interest in subsidiary																																																																										5,600,000							12,700,000	7,400,000
Additional amount agreed to be contributed as working capital																																										2,000,000	100,000,000																																		2,000,000	100,000,000
Amount contributed as working capital at closing																																										500,000	25,000,000																																		500,000	25,000,000
Consideration paid to acquire interest in licensees																																		1
Contribution made to investment	37,000					62,000,000																																			2,000,000			2,600,000	1,100,000	2,100,000	2,000,000	3,000,000	4,000,000	8,000,000			63,500,000						141,000,000	34,000,000			1,100,000	2,100,000
Cash collateral deposited under the terms of the entity's financing agreements																																		4,100,000		2,200,000
Cash collateral released and distributed to the Scion members																																	3,300,000
Remaining cash collateral, restricted cash	61,534,000	26,894,000	16,362,000																																5,600,000		800,000
Committed contribution to joint venture																																								6,500,000	5,000,000									20,000,000	9,000,000
Consolidated assets that are collateral for variable interest entity's obligations																															10,300,000	10,600,000																						183,100,000	183,400,000
Payment received upon sale of interest in subsidiary																																																																																		8,000,000
Investment with a cost basis																																																																																	2,600,000	600,000
Equity earnings on joint ventures	1,936,000	1,298,000																																																																															6,400,000	3,700,000
Joint venture ownership interest																																																																																	50.00%	50.00%
Fair value of investment with a cost basis																																																																																	15,300,000
Agreed price for sale of interest in a subsidiary																																																				6,000,000														5,700,000				4,000,000	4,000,000
Period for revenue recognition																																																																	3 years
Business acquisition purchase price, common stock issued, shares								588,688
Business acquisition purchase price, common stock issued, value								8,000,000
Business acquisition additional common stock issued, value								1,000,000
Non-cash pre-tax re-measurement gain						21,500,000
Cash payment for acquisition of assets						55,000,000
Cash entitled to be received by seller based on certain criteria						7,000,000							3,000,000
Prepaid royalties						7,000,000
Guaranteed minimum royalties period						2 years
Amount released as part of agreement termination							2,000,000
Contingency provision amended and considered earned by NT							5,000,000
Percentage of interest in joint venture after transaction																																																					51.00%
Indebtedness of joint venture																																																					90,000,000
Gain on sale of interest in subsidiary																																																																							7,000,000
Preferred profit distribution to the Company																23,000,000																																																								6,000,000
Acquisition of interest in MG Icon		4,000,000								4,000,000	8,000,000
Additional cash received by seller													1,000,000
Additional installment payment to be received by seller														1,000,000	1,000,000
Business acquisition remaining amount owed to Purim												10,000,000
Business acquisition remaining amount owed to Purim included in other current liabilities												5,000,000
Business acquisition remaining amount owed included in other liabilities												5,000,000
Notes loaned to subsidiary																																																												17,500,000	2,200,000	7,300,000
Notes receivable, annual interest rate																																																												6.00%
Notes receivable, minimum principal annual installments																																																												$ 2,200,000
Notes receivable, maturity date																																																												Jun. 03, 2015