v2.4.1.9

Selected Quarterly Financial Data - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	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