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Debt Arrangements - Additional Information (Detail) (USD $)
 3 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Feb. 28, 2015
Nov. 29, 2012
Jun. 30, 2014
Mar. 18, 2013
Mar. 13, 2013
Mar. 12, 2013
Mar. 31, 2013
May 23, 2011
May 17, 2011
Dec. 31, 2014
Jun. 21, 2013
Debt Instrument [Line Items]                          
Ownership Percentage                         50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Long term debt, current $ 61,123,000us-gaap_LongTermDebtCurrent                     $ 61,123,000us-gaap_LongTermDebtCurrent  
Cash, restricted cash 43,550,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue                     59,560,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue  
Long term debt 1,486,312,000us-gaap_LongTermDebt                     1,394,077,000us-gaap_LongTermDebt  
Non cash additional interest expense on convertible notes 7,516,000us-gaap_AmortizationOfDebtDiscountPremium 7,078,000us-gaap_AmortizationOfDebtDiscountPremium                      
Sale of 1.5% Convertible Notes, shares repurchased value 10,000,000us-gaap_StockRepurchasedDuringPeriodValue                        
Class A Variable Funding Note                          
Debt Instrument [Line Items]                          
Principal amount of long term debt       100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= icon_ClassAVariableFundingNoteMember		                  
Variable Funding Notes                          
Debt Instrument [Line Items]                          
Commitment fee on the unused portion of the variable funding notes facility     0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= icon_VariableFundingNotesMember		                    
Debt Instrument anticipated repayment year and month     2018-01                    
Additional interest rate     5.00%icon_AdditionalPercentageOfInterestRateDuringPrincipalDeferralPeriod
/ us-gaap_DebtInstrumentAxis
= icon_VariableFundingNotesMember		                    
Net proceeds received from issuance of debt     100,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= icon_VariableFundingNotesMember		                    
Hardy Way                          
Debt Instrument [Line Items]                          
Ownership Percentage       85.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= icon_HardyWayMember		                  
MG Icon                          
Debt Instrument [Line Items]                          
Ownership Percentage       50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= icon_MgIconLlcMember		                  
Zoo York brand                          
Debt Instrument [Line Items]                          
Ownership Percentage       100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= icon_ZooYorkHoldingsMember		                  
Peanuts Worldwide                          
Debt Instrument [Line Items]                          
Ownership Percentage       80.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= icon_PeanutsWorldwideMember		                  
Senior Secured Notes                          
Debt Instrument [Line Items]                          
Principal amount of long term debt 858,800,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember		     600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember		                 275,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember
Debt instrument, interest rate, stated percentage       4.229%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember		                 4.352%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember
Debt Instrument anticipated repayment year and month       2020-01                  
Additional interest rate       5.00%icon_AdditionalPercentageOfInterestRateDuringPrincipalDeferralPeriod
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember		                  
Debt instrument, quarterly payment         1,600,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember		                
Debt instrument, Maturity Date       2043-01                  
Debt instrument description of interest       If the Co-Issuers have not repaid or refinanced the Senior Secured Notes prior to the anticipated repayment date, additional interest will accrue on the Senior Secured Notes equal to the greater of (A) 5% per annum and (B) a per annum interest rate equal to the excess, if any, by which the sum of (i) the yield to maturity (adjusted to a quarterly bond-equivalent basis), on the anticipated repayment date of the United States treasury security having a term closest to 10 years plus (ii) 5% plus (iii) with respect to the 2012 Senior Secured Notes, 3.4%, or with respect to the 2013 Senior Secured Notes, 3.14%, exceeds the original interest rate.                  
Anticipated repayment date       10 years                  
Excess interest rate on original interest rate       3.40%icon_DebtInstrumentInterestAdditionalRateIncrease
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember		                  
Long term debt, current 61,100,000us-gaap_LongTermDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember		                        
Cash, restricted cash 43,600,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember		                     58,700,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember		  
Long term debt 758,750,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember		                     774,030,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesMember		  
Senior Secured Notes Due In Twenty Twelve                          
Debt Instrument [Line Items]                          
Debt instrument, quarterly payment       10,500,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesDueInTwentyTwelveMember		                  
Proceeds from issuance of debt instrument       150,400,000icon_ProceedFromIssuanceOfDebtInstrument
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesDueInTwentyTwelveMember		                  
Payments of securitized financing transaction       20,900,000us-gaap_PaymentsOfFinancingCosts
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesDueInTwentyTwelveMember		                  
Senior Secured Notes Due In Twenty Twelve | Umbro                          
Debt Instrument [Line Items]                          
Payment for the acquisition of Brand       218,300,000icon_BusinessAcquisitionPurchasePriceAllocationBrandName
/ us-gaap_BusinessAcquisitionAxis
= icon_UmbroMember
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesDueInTwentyTwelveMember		                  
Senior Secured Notes Due In Two Thousand Thirteen                          
Debt Instrument [Line Items]                          
Debt instrument, quarterly payment       4,800,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesDueInTwoThousandThirteenMember		                  
Excess interest rate on original interest rate       3.14%icon_DebtInstrumentInterestAdditionalRateIncrease
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesDueInTwoThousandThirteenMember		                  
Proceeds from issuance of debt instrument       7,200,000icon_ProceedFromIssuanceOfDebtInstrument
/ us-gaap_LongtermDebtTypeAxis
= icon_SeniorSecuredNotesDueInTwoThousandThirteenMember		                  
1.50% Convertible Notes                          
Debt Instrument [Line Items]                          
Principal amount of long term debt 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		         400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		              
Debt instrument, interest rate, stated percentage 1.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		         1.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		           1.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		  
Net proceeds received from issuance of debt           390,600,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		              
Debt instrument, maturity date           Mar. 15, 2018              
Debt instrument, payment terms           The 1.50% Convertible Notes bear interest at an annual rate of 1.50%, payable semi-annually in arrears on March 15 and September 15 of each year, beginning on September 15, 2013.              
Debt instrument, effective interest rate           6.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		              
Debt instrument, conversion rate           32.4052us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		              
Principal amount of each convertible note           1,000icon_DebtInstrumentConvertibleConversionRatioDenominator
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		              
Convertible notes, initial conversion price per share           $ 30.86us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		              
Long term debt 344,113,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		 [1]                     339,943,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		  
Non cash additional interest expense on convertible notes 3,900,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		 3,600,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		                      
Cash interest expense for convertible notes 1,500,000us-gaap_InterestExpenseDebtExcludingAmortization
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		 1,500,000us-gaap_InterestExpenseDebtExcludingAmortization
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		                      
Sale of 1.5% Convertible Notes, shares repurchased           2,964,000us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		              
Sale of 1.5% Convertible Notes, shares repurchased value           69,000,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		              
Sold warrants, shares of common stock             13,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		            
Sold warrants, shares of common stock strike price per share             $ 35.5173us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		            
Sold warrants, shares of common stock exercise date             Jun. 18, 2018            
Sold warrants, shares of common stock expiring date             Sep. 01, 2018            
Proceeds received from sale of sold warrants             57,700,000us-gaap_ProceedsFromIssuanceOfWarrants
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		            
Adjustments to additional paid in capital due convertible note hedge and warrants                 3,000,000icon_AdjustmentsToAdditionalPaidInCapitalWarrantsAndNoteHedge
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		        
Convertible notes, warrant strike price               $ 35.5173icon_DebtInstrumentConvertibleConversionWarrantStrikePrice
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		          
Percentage of premiums               52.50%icon_PercentageOfPremiums
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		          
Selling price per share of common stock               $ 23.29us-gaap_SharePrice
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		          
1.50% Convertible Notes | Scenario 1                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember
/ us-gaap_StatementScenarioAxis
= icon_Scenario1Member		                        
Debt Instrument, Redemption, Description Price equal to 100% of the principal amount of the 1.50% Convertible Notes, plus accrued and unpaid interest, if any                        
1.50% Convertible Notes | Scenario 2                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage 102.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember
/ us-gaap_StatementScenarioAxis
= icon_Scenario2Member		                        
Debt Instrument, Redemption, Description Price equal to 102% of the principal amount of the 1.50% Convertible Notes, plus accrued and unpaid interest, if any.                        
1.50% Convertible Notes | Long | Call Option                          
Debt Instrument [Line Items]                          
Convertible notes, common stock option shares           13,000,000us-gaap_OptionIndexedToIssuersEquityShares
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember		              
Payment for the purchased call option             84,100,000us-gaap_PaymentsForDerivativeInstrumentFinancingActivities
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember		            
Deferred income tax related to convertible notes 17,400,000us-gaap_DeferredTaxAssetsNet
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember		           29,400,000us-gaap_DeferredTaxAssetsNet
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember		            
1.50% Convertible Notes | Semi Annual Payment, First Payment                          
Debt Instrument [Line Items]                          
Debt instrument, interest payment period           --03-15              
1.50% Convertible Notes | Semi Annual Payment, Second Payment                          
Debt Instrument [Line Items]                          
Debt instrument, interest payment period           --09-15              
1.50% Convertible Notes | Minimum                          
Debt Instrument [Line Items]                          
Percentage of closing price of the Company's common stock for at least 20 trading days in the 30 consecutive trading days           130.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		              
1.50% Convertible Notes | Maximum                          
Debt Instrument [Line Items]                          
Percentage of closing price of the Company's common stock for at least 20 trading days in the 30 consecutive trading days           98.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		              
2.50% Convertible Notes                          
Debt Instrument [Line Items]                          
Principal amount of long term debt 300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		                 300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		      
Debt instrument, interest rate, stated percentage 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		                 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		   2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		  
Net proceeds received from issuance of debt                   291,600,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		      
Debt instrument, payment terms                   The 2.50% Convertible Notes bear interest at an annual rate of 2.50%, payable semi-annually in arrears on June 1 and December 1 of each year, beginning December 1, 2011.      
Debt instrument, effective interest rate                   7.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		      
Debt instrument, conversion rate                   32.5169us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		      
Principal amount of each convertible note                   1,000icon_DebtInstrumentConvertibleConversionRatioDenominator
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		      
Convertible notes, initial conversion price per share                   $ 30.75us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		      
Long term debt 283,449,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		 [2]                     280,104,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		  
Non cash additional interest expense on convertible notes 3,000,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		 2,800,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		                      
Cash interest expense for convertible notes 1,900,000us-gaap_InterestExpenseDebtExcludingAmortization
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		 1,900,000us-gaap_InterestExpenseDebtExcludingAmortization
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		                      
Sold warrants, shares of common stock                   9,760,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		      
Sold warrants, shares of common stock strike price per share                   $ 40.6175us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		      
Sold warrants, shares of common stock exercise date                   Sep. 01, 2016      
Sold warrants, shares of common stock expiring date                   Dec. 31, 2016      
Proceeds received from sale of sold warrants                   28,800,000us-gaap_ProceedsFromIssuanceOfWarrants
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		      
Adjustments to additional paid in capital due convertible note hedge and warrants                   (9,400,000)icon_AdjustmentsToAdditionalPaidInCapitalWarrantsAndNoteHedge
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		      
Convertible notes, warrant strike price                     $ 40.6175icon_DebtInstrumentConvertibleConversionWarrantStrikePrice
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		    
Percentage of premiums                     75.00%icon_PercentageOfPremiums
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		    
Selling price per share of common stock                     $ 23.21us-gaap_SharePrice
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember		    
Debt instrument, maturity date, month and year                   2016-06      
2.50% Convertible Notes | Scenario 1                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember
/ us-gaap_StatementScenarioAxis
= icon_Scenario1Member		                        
Debt Instrument, Redemption, Description Purchase price equal to 100% of the principal amount of the 2.50% Convertible Notes, plus accrued and unpaid interest, if any.                        
2.50% Convertible Notes | Scenario 2                          
Debt Instrument [Line Items]                          
Debt Instrument, Redemption Price, Percentage 102.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember
/ us-gaap_StatementScenarioAxis
= icon_Scenario2Member		                        
Debt Instrument, Redemption, Description Price equal to 102% of the principal amount of the 2.50% Convertible Notes, plus accrued and unpaid interest, if any.                        
2.50% Convertible Notes | Long | Call Option                          
Debt Instrument [Line Items]                          
Convertible notes, common stock option shares                   9,800,000us-gaap_OptionIndexedToIssuersEquityShares
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember		      
Payment for the purchased call option                   58,700,000us-gaap_PaymentsForDerivativeInstrumentFinancingActivities
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember		      
Deferred income tax related to convertible notes $ 4,900,000us-gaap_DeferredTaxAssetsNet
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember		                 $ 20,600,000us-gaap_DeferredTaxAssetsNet
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_PositionAxis
= us-gaap_LongMember		      
2.50% Convertible Notes | Semi Annual Payment, First Payment                          
Debt Instrument [Line Items]                          
Debt instrument, interest payment period                   --06-01      
2.50% Convertible Notes | Semi Annual Payment, Second Payment                          
Debt Instrument [Line Items]                          
Debt instrument, interest payment period                   --12-01      
2.50% Convertible Notes | Minimum                          
Debt Instrument [Line Items]                          
Percentage of closing price of the Company's common stock for at least 20 trading days in the 30 consecutive trading days                   130.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
2.50% Convertible Notes | Maximum                          
Debt Instrument [Line Items]                          
Percentage of closing price of the Company's common stock for at least 20 trading days in the 30 consecutive trading days                   98.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesTwoPointFiveZeroPercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
[1] Reflects the net debt carrying amount of the 1.50% Convertible Notes in the consolidated balance sheet as of March 31, 2015, in accordance with accounting for convertible notes. The principal amount owed to the holders of the 1.50% Convertible Notes is $400.0 million.
[2] Reflects the net debt carrying amount of the 2.50% Convertible Notes in the consolidated balance sheet as of March 31, 2015, in accordance with accounting for convertible notes. The principal amount owed to the holders of the 2.50% Convertible Notes is $300.0 million.