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Recent Accounting Standards - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unrecognized tax benefits	$ 2.7us-gaap_UnrecognizedTaxBenefits
Netted against deferred tax assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unrecognized tax benefits	$ 1.2us-gaap_UnrecognizedTaxBenefits / mstr_SignificantChangeInUnrecognizedTaxBenefitsByItemAxis = mstr_UnrecognizedTaxBenefitsOtherMember

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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