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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2014
Dec. 31, 2014
Location
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Significant Accounting Policies [Line Items]          
Network of branch offices   281chrw_BranchOffices     281chrw_BranchOffices
Restricted cash   $ 359,388us-gaap_IncreaseDecreaseInRestrictedCash $ 0us-gaap_IncreaseDecreaseInRestrictedCash $ 0us-gaap_IncreaseDecreaseInRestrictedCash  
Shared transactions between branches Our offices work together to complete transactions and collectively meet the needs of our customers. For large multi-location customers, we often coordinate our efforts in one location and rely on multiple locations to deliver specific geographic or modal needs. As an example, approximately 48 percent of our truckload transactions are shared transactions between offices.        
Property and equipment, depreciation method Depreciation is computed using the straight-line method over the estimated lives of the assets of 3 to 30 years.        
Intangible assets, amortization method These intangible assets are being amortized using the straight-line method over their estimated lives, ranging from 3 to 8 years.        
Software          
Significant Accounting Policies [Line Items]          
Intangible assets, estimated lives (in years)   3 years      
Intangible assets, amortization method We amortize software using the straight-line method over 3 years.        
Minimum          
Significant Accounting Policies [Line Items]          
Property and equipment, estimated lives (in years)   3 years      
Intangible assets, estimated lives (in years)   3 years      
Restricted shares and restricted units grants, discount for post-vesting holding restrictions   17.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDiscountForPostvestingRestrictions
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Maximum          
Significant Accounting Policies [Line Items]          
Property and equipment, estimated lives (in years)   30 years      
Intangible assets, estimated lives (in years)   8 years      
Restricted shares and restricted units grants, discount for post-vesting holding restrictions   22.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsDiscountForPostvestingRestrictions
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Truckload Transactions          
Significant Accounting Policies [Line Items]          
Percentage of truckload transactions that are shared transactions between branches   48.00%chrw_SegmentReportingInformationPercentageOfIntersegmentTransactions
/ us-gaap_StatementBusinessSegmentsAxis
= chrw_TruckloadTransactionsMember
     
Freightquote          
Significant Accounting Policies [Line Items]          
Restricted cash         $ 359,400us-gaap_IncreaseDecreaseInRestrictedCash
/ us-gaap_BusinessAcquisitionAxis
= chrw_FreightquoteMember