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Other Liabilities - Current - Additional Information (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
MG Icon    
Other Current Liabilities [Line Items]    
Business acquisition remaining amount owed to Purim included in other current liabilities $ 4,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= icon_MgIconLlcMember		 $ 4,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= icon_MgIconLlcMember
Other current liabilities    
Other Current Liabilities [Line Items]    
Due to related parties $ 11,900,000us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember		 $ 8,700,000us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember