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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

X

- 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