v2.4.0.6
Document And Entity Information
6 Months Ended
Jun. 30, 2011
Jul. 27, 2011
Class A [Member]
Jul. 27, 2011
Class B [Member]
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Jun. 30, 2011    
Document Fiscal Period Focus Q2    
Document Fiscal Year Focus 2011    
Trading Symbol mstr    
Entity Registrant Name MICROSTRATEGY INC    
Entity Central Index Key 0001050446    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   8,217,394 2,492,830