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Reconciliation of Consideration Paid and Estimated Fair Value of Assets Acquired (Parenthetical) (Detail)
Feb. 28, 2015
Mar. 31, 2015
Pony International, LLC.    
Business Acquisition [Line Items]    
Controlling interest 75.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ dei_LegalEntityAxis
= icon_PonyInternationalLlcMember		  
Non controlling interest 25.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= icon_PonyInternationalLlcMember		  
Iconix China    
Business Acquisition [Line Items]    
Controlling interest   50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ dei_LegalEntityAxis
= icon_IconixChinaMember