v2.4.1.9

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

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
Name: | mstr_IncreaseInIncomeFromContinuingOperationsFromReductionInAccruedBonusExpense
Namespace Prefix: | mstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | mstr_QuarterlyFinancialInformationLineItems
Namespace Prefix: | mstr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration