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Basis of Presentation and Summary of Significant Accounting Policies (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Advertising Costs and Vendor Consideration      
Total net advertising expenditures $ 4.3us-gaap_AdvertisingExpense $ 4.6us-gaap_AdvertisingExpense $ 4.0us-gaap_AdvertisingExpense
Products manufactured by Apple | Net sales      
Sale of products      
Net sales (as a percent) 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ProductOrServiceAxis
= pcmi_ProductsManufacturedByAppleMember		 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ProductOrServiceAxis
= pcmi_ProductsManufacturedByAppleMember		 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ProductOrServiceAxis
= pcmi_ProductsManufacturedByAppleMember
Products manufactured by HP | Net sales      
Sale of products      
Net sales (as a percent) 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ProductOrServiceAxis
= pcmi_ProductsManufacturedByHPMember		 21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ProductOrServiceAxis
= pcmi_ProductsManufacturedByHPMember		 21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ProductOrServiceAxis
= pcmi_ProductsManufacturedByHPMember