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FINANCING ARRANGEMENTS (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Aug. 23, 2013
Oct. 29, 2012
Feb. 28, 2015
Level 2          
Debt Instrument [Line Items]          
Long-term debt fair value $ 516,300,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 500,000,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		      
Unsecured Debt | Current Liability          
Debt Instrument [Line Items]          
Borrowing outstanding   375,000,000us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_BalanceSheetLocationAxis
= chrw_CurrentLiabilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		      
Unsecured Debt | Senior Unsecured Revolving Credit Facility 2017 Term Loan          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity 900,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		     500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		  
Additional borrowing capacity credit facility       500,000,000chrw_AdditionalBorrowingCapacityCreditFacility
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		  
Debt instrument, interest rate during period 1.70%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		 1.20%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		      
Debt, weighted average interest rate 1.30%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		 1.70%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		      
Debt instrument, covenant, leverage ratio, minimum 0.65chrw_DebtInstrumentCovenantLeverageRatioMinimum
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		        
Debt instrument, covenant, leverage ratio, maximum 1.00chrw_DebtInstrumentCovenantLeverageRatioMaximum
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		        
Unsecured Debt | Senior Unsecured Revolving Credit Facility 2017 Term Loan | Federal Funds Rate          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_VariableRateAxis
= chrw_FederalFundsRateMember		        
Unsecured Debt | Senior Unsecured Revolving Credit Facility 2017 Term Loan | LIBOR Rate Option          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis One-month LIBOR        
Unsecured Debt | Senior Unsecured Revolving Credit Facility 2017 Term Loan | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
Unsecured Debt | Senior Unsecured Revolving Credit Facility 2017 Term Loan | Current Liability          
Debt Instrument [Line Items]          
Borrowing outstanding 605,000,000us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_BalanceSheetLocationAxis
= chrw_CurrentLiabilityMember
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		        
Senior Notes | Series A Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount     175,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= chrw_SeriesANotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt instrument, interest rate, stated percentage     3.97%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= chrw_SeriesANotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Senior Notes | Series B Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount     150,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= chrw_SeriesBNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt instrument, interest rate, stated percentage     4.26%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= chrw_SeriesBNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Senior Notes | Series C Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount     175,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= chrw_SeriesCNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt instrument, interest rate, stated percentage     4.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= chrw_SeriesCNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Senior Notes | Note Purchase Agreement          
Debt Instrument [Line Items]          
Debt instrument, covenant, leverage ratio, minimum 0.65chrw_DebtInstrumentCovenantLeverageRatioMinimum
/ us-gaap_DebtInstrumentAxis
= chrw_NotePurchaseAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Debt instrument, covenant, leverage ratio, maximum 1.00chrw_DebtInstrumentCovenantLeverageRatioMaximum
/ us-gaap_DebtInstrumentAxis
= chrw_NotePurchaseAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Debt instrument, interest expense ratio, maximum 2.00chrw_DebtInstrumentCovenantInterestExpenseRatioMaximum
/ us-gaap_DebtInstrumentAxis
= chrw_NotePurchaseAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Debt instrument, interest expense ratio, minimum 1.00chrw_DebtInstrumentCovenantInterestExpenseRatioMinimum
/ us-gaap_DebtInstrumentAxis
= chrw_NotePurchaseAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Debt instrument, priority debt, percentage 15.00%chrw_DebtInstrumentCovenantPriorityDebtPercentage
/ us-gaap_DebtInstrumentAxis
= chrw_NotePurchaseAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
Debt instrument, redemption price, percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= chrw_NotePurchaseAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Subsequent Event | Unsecured Debt | Senior Unsecured Revolving Credit Facility 2017 Term Loan          
Debt Instrument [Line Items]          
Debt instrument, covenant, leverage debt to EBITDA ratio, maximum         3.00chrw_DebtInstrumentCovenantLeverageDebttoEBITDARatioMaximum
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Debt instrument, covenant, leverage debt to EBITDA ratio, minimum         1.00chrw_DebtInstrumentCovenantLeverageDebttoEBITDARatioMinimum
/ us-gaap_DebtInstrumentAxis
= chrw_SeniorUnsecuredRevolvingCreditFacility2017TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Event | Senior Notes | Note Purchase Agreement          
Debt Instrument [Line Items]          
Debt instrument, covenant, leverage debt to EBITDA ratio, maximum         3.00chrw_DebtInstrumentCovenantLeverageDebttoEBITDARatioMaximum
/ us-gaap_DebtInstrumentAxis
= chrw_NotePurchaseAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Debt instrument, covenant, leverage debt to EBITDA ratio, minimum         1.00chrw_DebtInstrumentCovenantLeverageDebttoEBITDARatioMinimum
/ us-gaap_DebtInstrumentAxis
= chrw_NotePurchaseAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember