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Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) $ in Millions | 3 Months Ended
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Dec. 31, 2016 USD ($) Executive
Quarterly Financial Information Disclosure [Abstract] |
Number of executives departed in connection with an executive management reorganization in January 2016 | Executive | 2
Increase in net income as a result of reversal of accrual for potential future payments in connection with an executive management reorganization in January 2016 | $ | $ 3.4

X
- Definition Increase in net income as a result of reversal of accrual for potential future payments in connection with an executive management reorganization in January 2016. + References No definition available. + Details
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Namespace Prefix: | mstr_
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Period Type: | duration

X
- Definition The number of executives departed in connection with an executive management reorganization in January 2016. + References No definition available. + Details
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Namespace Prefix: | mstr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration