XML 42 R1.htm IDEA: XBRL DOCUMENT v3.3.0.814
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2015
Oct. 22, 2015
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2015  
Document Fiscal Year Focus 2015  
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  
Class A    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   9,329,603
Class B Convertible    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   2,035,184