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Property and Depreciation Schedule of Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 31, 2015
Jan. 30, 2015
Property, Plant and Equipment [Line Items]          
Depreciation $ 35,040us-gaap_Depreciation $ 32,917us-gaap_Depreciation $ 28,937us-gaap_Depreciation    
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down     1,066us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown    
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member]          
Property, Plant and Equipment [Line Items]          
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent 7,669us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ graybar_DisposalGroupClassificationAxis
= graybar_DisposalGroupHeldforsaleorDisposedofbySaleNotDiscontinuedOperationsMember
7,626us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ graybar_DisposalGroupClassificationAxis
= graybar_DisposalGroupHeldforsaleorDisposedofbySaleNotDiscontinuedOperationsMember
     
Disposal Group, Including Discontinued Operation, Consideration 740us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ graybar_DisposalGroupClassificationAxis
= graybar_DisposalGroupHeldforsaleorDisposedofbySaleNotDiscontinuedOperationsMember
34us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ graybar_DisposalGroupClassificationAxis
= graybar_DisposalGroupHeldforsaleorDisposedofbySaleNotDiscontinuedOperationsMember
     
Gain on sale of assets held for sale 85us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ graybar_DisposalGroupClassificationAxis
= graybar_DisposalGroupHeldforsaleorDisposedofbySaleNotDiscontinuedOperationsMember
23us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ graybar_DisposalGroupClassificationAxis
= graybar_DisposalGroupHeldforsaleorDisposedofbySaleNotDiscontinuedOperationsMember
     
Building          
Property, Plant and Equipment [Line Items]          
Estimated useful asset life 42 years        
Furniture, Fixtures & Equipment and Software | Minimum          
Property, Plant and Equipment [Line Items]          
Estimated useful asset life 3 years        
Furniture, Fixtures & Equipment and Software | Maximum          
Property, Plant and Equipment [Line Items]          
Estimated useful asset life 14 years        
Software and Software Development Costs          
Property, Plant and Equipment [Line Items]          
Property plant and equipment additions 3,501us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
3,187us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
     
Assets Held under Capital Leases          
Property, Plant and Equipment [Line Items]          
Property plant and equipment additions 10,430us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
3,632us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
     
Capitalized Interest Costs          
Property, Plant and Equipment [Line Items]          
Interest costs capitalized 102us-gaap_InterestCostsCapitalized
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
182us-gaap_InterestCostsCapitalized
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
56us-gaap_InterestCostsCapitalized
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
   
Subsequent Event [Member] | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member]          
Property, Plant and Equipment [Line Items]          
Gain on sale of assets held for sale       3,584us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ graybar_DisposalGroupClassificationAxis
= graybar_DisposalGroupHeldforsaleorDisposedofbySaleNotDiscontinuedOperationsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Disposal Group, Including Discontinued Operation, Assets         $ 4,626us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ graybar_DisposalGroupClassificationAxis
= graybar_DisposalGroupHeldforsaleorDisposedofbySaleNotDiscontinuedOperationsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember