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LITIGATION (Details)	6 Months Ended
	Jun. 30, 2018 case
Contingent Auto Liability Claim
Loss Contingencies [Line Items]
Contingency auto liability cases (case)	14

X

- Definition

Loss Contingency, Number of Auto Liability Cases

+ References

No definition available.

+ Details

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Namespace Prefix:	chrw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Details

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