Investments and Joint Ventures - Additional Information (Detail) (USD $)	9 Months Ended				1 Months Ended	9 Months Ended		12 Months Ended			1 Months Ended							1 Months Ended							1 Months Ended		12 Months Ended	1 Months Ended					1 Months Ended		9 Months Ended		1 Months Ended					9 Months Ended			1 Months Ended	9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Nov. 07, 2007 Scion Artful Dodger	Mar. 31, 2009 Scion Variable Interest Entity, Not Primary Beneficiary Cost method of accounting	Sep. 30, 2011 Scion Variable Interest Entity, Not Primary Beneficiary Cost method of accounting	Sep. 30, 2010 Scion Variable Interest Entity, Not Primary Beneficiary Cost method of accounting	Dec. 31, 2010 Scion Variable Interest Entity, Not Primary Beneficiary Cost method of accounting	Sep. 30, 2011 Scion Cost method of accounting	Dec. 31, 2010 Scion Cost method of accounting	Mar. 31, 2009 Parent Company Variable Interest Entity, Not Primary Beneficiary Cost method of accounting	Sep. 30, 2008 Parent Company Equity method of accounting	May 31, 2011 Novel Equity method of accounting	Jul. 31, 2010 Novel Equity method of accounting	Sep. 30, 2008 Novel Equity method of accounting	Sep. 30, 2011 Novel Equity method of accounting	Sep. 30, 2009 Novel Equity method of accounting	Dec. 29, 2008 Iconix Latin America Equity method of accounting	Oct. 31, 2009 Licensing agreements IPH Unltd Ecko Assets Year	Oct. 31, 2009 IPH Unltd	Sep. 30, 2011 IPH Unltd	Jul. 27, 2011 IPH Unltd	Dec. 31, 2010 IPH Unltd	Oct. 31, 2009 IPH Unltd Ecko Assets	Jan. 31, 2011 Iconix Europe Equity method of accounting	Dec. 31, 2009 Iconix Europe Equity method of accounting	Dec. 31, 2009 Iconix Europe Equity method of accounting	Jun. 03, 2010 Peanuts Worldwide Icon Entertainment LLC	Jun. 03, 2010 Peanuts Worldwide Beagle Scout LLC	Sep. 30, 2011 Peanuts Worldwide Beagle Scout LLC Other assets - current	Sep. 30, 2011 Peanuts Worldwide Beagle Scout LLC Other assets - non-current	Apr. 26, 2011 Hardy Way	Apr. 26, 2011 Hardy Way Equity method of accounting	May 31, 2009 Hardy Way Equity method of accounting	Sep. 30, 2011 Hardy Way Equity method of accounting	Sep. 30, 2010 MG Icon	Mar. 31, 2011 MG Icon Equity method of accounting	Mar. 31, 2010 MG Icon Equity method of accounting	Sep. 30, 2011 MG Icon Equity method of accounting	Sep. 30, 2011 MG Icon Equity method of accounting Other current liabilities	Sep. 30, 2011 MG Icon Equity method of accounting Other liabilities	Sep. 30, 2011 MG Icon Equity method of accounting Minimum	Jun. 30, 2010 Peanuts Worldwide	Jun. 03, 2010 Peanuts Worldwide	Jun. 03, 2010 Peanuts Worldwide Licensing agreements Year	Sep. 30, 2011 Licensing agreements Year
Schedule of Investments [Line Items]
Percentage of minority interest in subsidiary																				49.00%									20.00%
Contribution made to investment											$ 2,100,000	$ 2,000,000	$ 3,000,000	$ 4,000,000	$ 8,000,000					$ 63,500,000								$ 141,000,000	$ 34,000,000				$ 62,000,000
Percentage of interest in joint venture after transaction																				51.00%
Cash payment for acquisition of assets																																	55,000,000
Future contribution to be made to investment year one																2,000,000
Controlling interest					16.60%																	100.00%						80.00%				85.00%	85.00%	50.00%				50.00%					80.00%
Cash entitled to be received by sellers upon the achievement of earn-out																																	7,000,000
Business acquisition total purchase price				15,000,000																		18,000,000												17,000,000				20,000,000
Prepaid royalties																																	7,000,000
Consideration paid to acquire interest in licensees					1
Indebtedness of joint venture																				90,000,000
Business acquisition purchase price, cash paid																												172,100,000						9,000,000
Guaranteed minimum royalties, number of years																																	2 years
Acquisition of interest in MG Icon																																				4,000,000	4,000,000	4,000,000
Business acquisition purchase price, common stock issued, shares																																		588,688
Business acquisition remaining amount owed to Purim																																							12,000,000	4,000,000	8,000,000
Business acquisition purchase price, common stock issued, value																																		8,000,000
Business acquisition additional common stock issued, value																																		1,000,000
Cash collateral deposited under the terms of the entity's financing agreements					4,100,000
Cash collateral released and distributed to the Scion members								3,300,000
Remaining cash collateral, restricted cash	13,465,000	3,300,000	2,872,000					800,000
Dividend from investment in licensee						0	600,000
Consolidated assets that are collateral for variable interest entity's obligations									11,900,000	12,600,000
Committed contribution to joint venture												5,000,000			20,000,000		9,000,000
Percentage of interest sold in equity method investment																		50.00%								50.00%	50.00%
Agreed price for sale of interest in a subsidiary																		6,000,000								4,000,000	4,000,000
Payment received upon sale interest in subsidiary																		1,000,000							1,000,000	3,000,000
Remaining receivable from sale of 50% interest in Iconix Latin America																		5,000,000
Gain on sale of interest in subsidiary																											7,000,000
Committed amount receivable period																		30 months
Gain on re-measurement of equity investment	21,465,000																																		21,500,000
Goodwill deductible for income tax purposes																								700,000									18,800,000											17,700,000
Minimum amortization contractual period of licensing contracts																			1																										1	1
Maximum amortization contractual period of licensing contracts																			9																										5	9
Consolidated assets that are collateral for variable interest entity's obligations																					185,300,000		209,100,000
Preferred profit distribution																																										20,000,000
Notes loaned to subsidiary																													17,500,000	2,200,000	13,100,000
Notes receivable, annual interest rate																													6.00%
Notes receivable, minimum principal annual installments																													$ 2,200,000
Notes receivable, maturity date																													Jun. 03, 2015