v2.4.0.6
Document and Entity Information
9 Months Ended
Sep. 30, 2012
Oct. 23, 2012
Class A
Oct. 23, 2012
Class B Convertible
Document Information      
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Sep. 30, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus Q3    
Trading Symbol MSTR    
Entity Registrant Name MICROSTRATEGY INC    
Entity Central Index Key 0001050446    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   8,997,853 2,227,327