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v3.3.1.900

Selected Quarterly Financial Data - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2014 USD ($)
Quarterly Financial Information [Line Items] |
Increase in net income as result of reduction in its accrued bonus expense | $ 7.4

X
- Definition The amount of increase in income from continuing operations as a result of a reduction in accrued bonus expense. + References No definition available. + Details
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Namespace Prefix: | mstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Quarterly Financial Information [Line Items] + References No definition available. + Details
Name: | mstr_QuarterlyFinancialInformationLineItems
Namespace Prefix: | mstr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration