Document and Entity Information
6 Months Ended
Jun. 30, 2014
Aug. 05, 2014
Document and Entity Information    
Entity Registrant Name PCM, INC.  
Entity Central Index Key 0000937941  
Document Type 10-Q  
Document Period End Date Jun. 30, 2014  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   12,376,236
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q2