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LITIGATION (Details) | 9 Months Ended
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Sep. 30, 2018 case
Contingent Auto Liability Claim |
Loss Contingencies [Line Items] |
Contingency auto liability cases (case) | 15

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- Definition Loss Contingency, Number of Auto Liability Cases + References No definition available. + Details
Name: | chrw_LossContingencyNumberofAutoLiabilityCases
Namespace Prefix: | chrw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=chrw_ContingentAutoLiabilityClaimMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |