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LITIGATION Litigation (Details) (Contingent Auto Liability Claim)
 3 Months Ended
Mar. 31, 2015
case
Contingent Auto Liability Claim
  
Loss Contingencies [Line Items]  
Contingency auto liability cases 21chrw_LossContingencyNumberofAutoLiabilityCases
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= chrw_ContingentAutoLiabilityClaimMember