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ACCELERATED SHARE REPURCHASE (Details) (USD $)
12 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 13, 2013
Feb. 28, 2014
Mar. 31, 2014
Sep. 30, 2013
Aug. 24, 2013
Subsequent Event [Line Items]                
Treasury stock value $ 164,037,000us-gaap_TreasuryStockValueAcquiredCostMethod $ 760,304,000us-gaap_TreasuryStockValueAcquiredCostMethod $ 257,064,000us-gaap_TreasuryStockValueAcquiredCostMethod          
Accelerated Share Repurchase                
Subsequent Event [Line Items]                
Accelerated share repurchases, settlement payment               500,000,000us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
Accelerated share repurchases, pursuant discount percentage               0.94%chrw_AcceleratedShareRepurchasesPursuantDiscountPercentage
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
Shares repurchased 7,300,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
7,300,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
  1,200,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
1,200,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
  6,100,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
 
Treasury stock value   425,000,000us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
        350,000,000us-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   $ 75,000,000us-gaap_AcceleratedShareRepurchaseProgramAdjustment
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember
      $ 75,000,000us-gaap_AcceleratedShareRepurchaseProgramAdjustment
/ us-gaap_ShareRepurchaseProgramAxis
= chrw_AcceleratedShareRepurchaseMember