Assets and Liabilities of Angel Dot Com Business Classified as Held for Sale (Parenthetical) (Detail) (Angel. Com, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Angel. Com
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Unpaid Deferred Revenue	$ 554
Allowance for doubtful accounts	347
Unpaid Deferred Revenue	$ 554

Disposal Group Including Discontinued Operation Unpaid Deferred Revenue Reduction

No definition available.

Name:	mstr_DisposalGroupIncludingDiscontinuedOperationUnpaidDeferredRevenueReduction
Namespace Prefix:	mstr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant