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Changes in Fair Value of Foreign Currency Forward Contracts (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) on derivative instruments | $ 949 us-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 | 949 us-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 | $ 0 us-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 + Details
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