v3.10.0.1
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2018
Jul. 16, 2018
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
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   9,432,210
Class B Convertible    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   2,035,184