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Summary of Company Information (Details)
Dec. 31, 2014
distribution_centers
customer_locations
Summary of Company Information [Line Items]  
Number of customer locations 35,000core_NumberOfCustomerLocations
Number of distribution centers 29core_NumberOfDistributionCenters
Number of distribution facilities operated as a third party logistics provider 2core_NumberOfDistributionFacilitiesOperatedAsThirdPartyLogisticsProvider
United States [Member]  
Summary of Company Information [Line Items]  
Number of distribution centers 25core_NumberOfDistributionCenters
/ us-gaap_StatementGeographicalAxis
= country_US
Canada [Member]  
Summary of Company Information [Line Items]  
Number of distribution centers 4core_NumberOfDistributionCenters
/ us-gaap_StatementGeographicalAxis
= country_CA