v2.4.1.9

Schedule Of Changes In Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule of Unrecognized Tax Benefits [Line Items]
Unrecognized tax benefits at January 1, 2014	$ 2,312us-gaap_UnrecognizedTaxBenefits
Increase related to positions taken in prior period	938us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Increase related to positions taken in current period	270us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Decrease related to expiration of statute of limitations	(60)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Unrecognized tax benefits at December 31, 2014	3,460us-gaap_UnrecognizedTaxBenefits
Accrued interest	292us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	300us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Netting of deferred tax assets and unrecognized tax benefits	(1,273)mstr_UnrecognizedTaxBenefitsDecreasesResultingFromNettingAgainstDeferredTaxAssets
Unrecognized tax benefits recorded in other long-term liabilities at December 31, 2014	$ 2,479us-gaap_LiabilityForUncertainTaxPositionsNoncurrent

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Amount of decrease in unrecognized tax benefits resulting from netting against deferred tax assets.

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The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of interest expense accrued for an underpayment of income taxes.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

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-Paragraph 15

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)(4)

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