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Basis of Presentation and Description of Company (Details)
 3 Months Ended
Mar. 31, 2015
segment
Basis of Presentation and Description of Company  
Number of reportable operating segments 3us-gaap_NumberOfOperatingSegments
Commercial  
Basis of Presentation and Description of Company  
Revenue percentage 80.00%pcmi_EntityWideRevenueSegmentPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= pcmi_CommercialMember
Public Sector  
Basis of Presentation and Description of Company  
Revenue percentage 12.00%pcmi_EntityWideRevenueSegmentPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= pcmi_PublicSectorMember
MacMall  
Basis of Presentation and Description of Company  
Revenue percentage 8.00%pcmi_EntityWideRevenueSegmentPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= pcmi_MacMallMember
Retail stores closed | MacMall  
Basis of Presentation and Description of Company  
Number of retail stores discontinued 4pcmi_DiscontinuedOperationNumberOfRetailStoresClosed
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= pcmi_RetailStoresClosedMember
/ us-gaap_StatementBusinessSegmentsAxis
= pcmi_MacMallMember