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Basis of Presentation and Summary of Significant Accounting Policies (Details 5) (USD $)
0 Months Ended 12 Months Ended
Oct. 02, 2014
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets      
Impairment of goodwill $ 0us-gaap_GoodwillImpairmentLoss    
Impairment of other indefinite-lived intangible assets 0pcmi_ImpairmentOfOtherIndefiniteLivedIntangibleAssets    
Estimated life of trademarks for tax purposes to compute tax amortization used in computing fair value of indefinite-live trademarks under the royalty method   15 years  
Goodwill      
Goodwill   25,510,000us-gaap_Goodwill 25,510,000us-gaap_Goodwill
Implied control premium (as a percent) 27.00%us-gaap_FairValueInputsControlPremium    
Commercial without Abreon      
Goodwill      
Excess of fair values of reporting units over individual carrying values (as a percent)   41.00%pcmi_ExcessOfFairValuesOfReportingUnitsOverCarryingValuesPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= pcmi_CommercialWithoutAbreonMember
 
Goodwill   18,300,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pcmi_CommercialWithoutAbreonMember
 
Abreon      
Goodwill      
Excess of fair values of reporting units over individual carrying values (as a percent)   70.00%pcmi_ExcessOfFairValuesOfReportingUnitsOverCarryingValuesPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= pcmi_AbreonMember
 
Goodwill   $ 7,200,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pcmi_AbreonMember