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COMMITMENTS AND CONTINGENCIES - Narrative (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Defined contribution match	6.00%	4.00%
Discretionary profit-sharing contribution		2.00%

X

- Definition

Defined Contribution Plan, Employer Discretionary Contribution Percent

+ References

No definition available.

+ Details

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Namespace Prefix:	chrw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration