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Subsequent Events - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Feb. 02, 2015
Feb. 18, 2015
Subsequent Event [Line Items]        
Proceed from long term debt $ 392,000us-gaap_ProceedsFromIssuanceOfLongTermDebt $ 750,000us-gaap_ProceedsFromIssuanceOfLongTermDebt    
Subsequent Event | Strawberry Shortcake        
Subsequent Event [Line Items]        
Business acquisition, agreed cash purchase price at closing date     105,000us-gaap_BusinessCombinationConsiderationTransferred1
/ dei_LegalEntityAxis
= icon_StrawberryShortcakeMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Subsequent Event | Pony International, LLC.        
Subsequent Event [Line Items]        
Business acquisition purchase price, cash paid     37,000us-gaap_PaymentsToAcquireBusinessesGross
/ dei_LegalEntityAxis
= icon_PonyInternationLlcMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Controlling interest     75.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ dei_LegalEntityAxis
= icon_PonyInternationLlcMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Percentage of minority interest in subsidiary     25.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= icon_PonyInternationLlcMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Subsequent Event | Class A Variable Funding Note        
Subsequent Event [Line Items]        
Proceed from long term debt       $ 100,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= icon_ClassAVariableFundingNoteMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember