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Subsequent Events (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
acre
Dec. 31, 2012
Mar. 13, 2015
Mar. 13, 2015
Jan. 15, 2015
Subsequent Event            
Cash paid on purchase of property $ 26,666,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment $ 17,213,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment $ 9,446,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment      
Area of Land   7.9us-gaap_AreaOfLand        
Subsequent Events | En Pointe Technologies Sales Inc            
Subsequent Event            
Initial purchase price       15,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= pcmi_EnPointeTechnologiesSalesIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Gross profit and service revenues target period         3 years  
Adjusted gross profit (in percentage)       22.50%pcmi_AdjustedGrossProfit
/ us-gaap_BusinessAcquisitionAxis
= pcmi_EnPointeTechnologiesSalesIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Service revenue (in percentage)       10.00%pcmi_ServiceRevenue
/ us-gaap_BusinessAcquisitionAxis
= pcmi_EnPointeTechnologiesSalesIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Subsequent Events | Sarcom Properties, Inc            
Subsequent Event            
Purchase price           6,600,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_CounterpartyNameAxis
= pcmi_SarcomPropertiesIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Cash paid on purchase of property           2,200,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_CounterpartyNameAxis
= pcmi_SarcomPropertiesIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Area of Land           12.4us-gaap_AreaOfLand
/ us-gaap_CounterpartyNameAxis
= pcmi_SarcomPropertiesIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Events | Sarcom Properties, Inc | Long Term Notes            
Subsequent Event            
Amount outstanding under credit agreement           $ 4,575,000us-gaap_SecuredDebt
/ us-gaap_CounterpartyNameAxis
= pcmi_SarcomPropertiesIncMember
/ us-gaap_LongtermDebtTypeAxis
= pcmi_LongTermNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Borrowing term           5 years
Principal repayment amortization period           25 years
Variable interest rate basis           LIBOR
Percentage points added to the reference rate           2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CounterpartyNameAxis
= pcmi_SarcomPropertiesIncMember
/ us-gaap_LongtermDebtTypeAxis
= pcmi_LongTermNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent Events | Sarcom Properties, Inc | Building and real property located in Ohio            
Subsequent Event            
Building space in square feet           144,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_CounterpartyNameAxis
= pcmi_SarcomPropertiesIncMember
/ us-gaap_MajorPropertyClassAxis
= us-gaap_BuildingMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember