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Stockholders' Equity - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 18, 2013
Jul. 31, 2013
Oct. 31, 2011
Feb. 28, 2013
Feb. 28, 2014
Aug. 13, 2009
Aug. 15, 2012
May 23, 2011
Class of Stock [Line Items]                      
Weighted average contractual term of awards outstanding 1 year 5 months 5 days 1 year 4 months 28 days 2 years 6 months 22 days                
Options vested 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares                
Options granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod                
Cash received from option exercise under all share-based payment arrangements $ 10,100,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions $ 400,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions $ 800,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions                
Tax benefit from share based payment arrangement 10,700,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 1,200,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 1,500,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions                
Aggregate intrinsic value of options exercised 40,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 4,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 5,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue                
Aggregate intrinsic value of options outstanding 3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue 44,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue 23,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue                
Aggregate intrinsic value of options exercisable 3,000,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 44,000,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 23,700,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1                
Value of common stock repurchased 19,179,000us-gaap_StockRepurchasedDuringPeriodValue 3,707,000us-gaap_StockRepurchasedDuringPeriodValue 1,195,000us-gaap_StockRepurchasedDuringPeriodValue                
1.50% Convertible Notes                      
Class of Stock [Line Items]                      
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		              
Value of common stock repurchased       69,000,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_LongtermDebtTypeAxis
= icon_ConvertibleNotesOnePointFiveZeroPercentMember		              
2.50% Convertible Notes                      
Class of Stock [Line Items]                      
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
Warrant                      
Class of Stock [Line Items]                      
Weighted average contractual term of awards outstanding and exercisable 3 years 9 months 4 days 3 years 7 months 28 days 4 years 7 months 28 days                
Exercised 170,000icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		 0icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		 0icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                
Share based compensation awards granted in period 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		                
Stock Repurchase Program                      
Class of Stock [Line Items]                      
Repurchase of common stock authorized value         300,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= icon_CommonStockRepurchaseProgramMember		 200,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= icon_CommonStockRepurchaseProgramMember		          
Period of common stock repurchase, years         3 years 3 years          
2013 Program                      
Class of Stock [Line Items]                      
Repurchase of common stock authorized value             300,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= icon_CommonStockRepurchaseProgramTwentyThirteenMember		        
Period of common stock repurchase, years             3 years        
Repurchase of common stock, available for repurchase 25,700,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= icon_CommonStockRepurchaseProgramTwentyThirteenMember		                    
2014 Program                      
Class of Stock [Line Items]                      
Repurchase of common stock authorized value               500,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= icon_StockRepurchaseProgramsTwentyFourteenMember		      
Period of common stock repurchase, years               3 years      
Repurchase of common stock, available for repurchase 500,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= icon_StockRepurchaseProgramsTwentyFourteenMember		                    
Stock Incentive Plan 2009                      
Class of Stock [Line Items]                      
Number of common stock shares authorized under Equity Incentive Plan                 3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= icon_StockIncentivePlanTwentyZeroNineMember		    
Plan expiration date                 Aug. 13, 2019    
Common stock reserved for issuance 2,327,704us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= icon_StockIncentivePlanTwentyZeroNineMember		                    
Common shares available for issuance 0us-gaap_CommonStockSharesOutstanding
/ us-gaap_AwardTypeAxis
= icon_StockIncentivePlanTwentyZeroNineMember		                    
Amended and Restated Stock Incentive Plan 2009                      
Class of Stock [Line Items]                      
Number of common stock shares authorized under Equity Incentive Plan                   7,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= icon_AmendedAndRestatedTwentyZeroNineStockIncentivePlanMember		  
Plan expiration date                   Aug. 15, 2022  
Number of additional common stock shares approved for issuance under amended and restated 2009 Equity Incentive Plan                   4,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= icon_AmendedAndRestatedTwentyZeroNineStockIncentivePlanMember		  
Stock Options                      
Class of Stock [Line Items]                      
Compensation expense related to stock grants 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                
Restricted Stock                      
Class of Stock [Line Items]                      
Compensation expense related to stock grants 18,500,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 20,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 11,500,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		                
Share based compensation awards granted in period 256,480us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 1,247,879us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 232,203us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		                
Share based compensation awards granted in period, fair market value 10,400,000icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 31,600,000icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 4,100,000icon_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		                
Compensation cost not yet recognized 6,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		                    
Compensation cost not yet recognized, period for recognition 3 years                    
Value of common stock repurchased $ 19,200,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 3,700,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 1,200,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		                
Restricted Stock | Maximum                      
Class of Stock [Line Items]                      
Share based compensation awards vesting period 5 years 5 years 5 years