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v3.10.0.1

Employee Benefit Plan - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Maximum employee contribution to 401k |  | 50.00% |  |
Employer matching contribution percent for plan participant |  | 50.00% |  |
Defined Contribution Plan, Sponsor Location [Extensible List] |  | country:US |  |
Defined Contribution Plan, Tax Status [Extensible List] |  | us-gaap:QualifiedPlanMember |  |
Maximum contribution by participant that employer will match at 50% |  | 6.00% |  |
Maximum annual contribution by employer |  | $ 3,000 |  |
Employer contribution to the plan |  | $ 2,400,000 | $ 2,100,000 | $ 1,900,000
Subsequent Event |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution percent for plan participant | 50.00% |  |  |
Defined Contribution Plan, Sponsor Location [Extensible List] | country:US |  |  |
Defined Contribution Plan, Tax Status [Extensible List] | us-gaap:QualifiedPlanMember |  |  |
Maximum contribution by participant that employer will match at 50% | 12.00% |  |  |
Maximum annual contribution by employer | $ 5,000 |  |  |

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- Definition Annual maximum contribution to participant 401k plan. + References No definition available. + Details
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Namespace Prefix: | mstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Indicates location of employer sponsoring defined contribution plan designed to provide retirement benefits. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | srt-types:extensibleListItemType
Balance Type: | na
Period Type: | instant

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- Definition Indicates tax status of defined contribution plan designed to provide retirement benefits. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanTaxStatusExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | srt-types:extensibleListItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |