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Changes in Fair Value of Foreign Currency Forward Contracts (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	$ 949us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments	$ (40)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
Unrealized (loss) gain on foreign currency forward contracts | Other (expense) income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	949us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments / mstr_DerivativeInstrumentsGainLossByNatureAxis = mstr_UnrealizedGainLossOnDerivativesMember / us-gaap_IncomeStatementLocationAxis = mstr_OtherIncomeExpenseNetMember	(40)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments / mstr_DerivativeInstrumentsGainLossByNatureAxis = mstr_UnrealizedGainLossOnDerivativesMember / us-gaap_IncomeStatementLocationAxis = mstr_OtherIncomeExpenseNetMember
Realized loss on foreign currency forward contracts | Other (expense) income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments	$ 0us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments / mstr_DerivativeInstrumentsGainLossByNatureAxis = mstr_RealizedGainLossOnDerivativesMember / us-gaap_IncomeStatementLocationAxis = mstr_OtherIncomeExpenseNetMember	$ (255)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments / mstr_DerivativeInstrumentsGainLossByNatureAxis = mstr_RealizedGainLossOnDerivativesMember / us-gaap_IncomeStatementLocationAxis = mstr_OtherIncomeExpenseNetMember

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- Definition

Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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