Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) $ in Millions	3 Months Ended
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

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.

No definition available.

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