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Income Taxes (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Operating loss carryforwards    
Unrecognized tax positions $ 0us-gaap_UnrecognizedTaxBenefits  
Accrued interest and penalties 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
State    
Operating loss carryforwards    
Net operating loss carryforwards expiring between 2016 and 2019 2.2pcmi_OperatingLossCarryforwardsExpiringBetween2016And2019
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Net operating loss carryforwards 31.7us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
State | Pre-acquisition losses from an acquired subsidiary    
Operating loss carryforwards    
Net operating loss carryforwards 1.1us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ pcmi_OperatingLossCarryforwardsAxis
= pcmi_PreAcquisitionLossesMember		  
Federal    
Operating loss carryforwards    
Net operating loss carryforwards 8.8us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		  
Federal | Pre-acquisition losses from an acquired subsidiary    
Operating loss carryforwards    
Net operating loss carryforwards 2.7us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
/ pcmi_OperatingLossCarryforwardsAxis
= pcmi_PreAcquisitionLossesMember		  
Canada    
Operating loss carryforwards    
Deferred taxes on cumulative undistributed earnings of subsidiary 0us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
/ us-gaap_IncomeTaxAuthorityAxis
= country_CA		  
Cumulative undistributed earnings of subsidiary $ 12.6us-gaap_UndistributedEarningsOfForeignSubsidiaries
/ us-gaap_IncomeTaxAuthorityAxis
= country_CA