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ACCELERATED SHARE REPURCHASE (Details) (Accelerated Share Repurchase, USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 13, 2013
Feb. 28, 2014
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2013
Dec. 31, 2013
Aug. 24, 2013
Accelerated Share Repurchase
             
Accelerated Share Repurchases [Line Items]              
Accelerated share repurchase amount             $ 500.0us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
Pursuant discount percentage             0.94%chrw_AcceleratedShareRepurchasesPursuantDiscountPercentage
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
Treasury shares acquired 1.2us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
1.2us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
8.5us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
8.5us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
6.1us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
   
Treasury shares value acquired         350.0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
425.0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
 
Value of stock repurchased as percentage of total amount of shares estimated under accelerated share repurchase agreement         70.00%chrw_ValueofStockRepurchasedAsPercentageofTotalAmountofSharesEstimatedUnderAcceleratedShareRepurchaseAgreement
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
   
Accelerated share repurchase program adjustment       $ 75.0us-gaap_AcceleratedShareRepurchaseProgramAdjustment
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
  $ 75.0us-gaap_AcceleratedShareRepurchaseProgramAdjustment
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember