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Subsequent Events - Additional Information (Detail) - Northern Virginia Office Space - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Lease expiration date		2020-12
Subsequent Event
Subsequent Event [Line Items]
Lease expiration date	2030-12
Subsequent Event | Minimum
Subsequent Event [Line Items]
Annual base rent	$ 10.0
Subsequent Event | Maximum
Subsequent Event [Line Items]
Annual base rent	$ 13.0

X

- Definition

Annual base rent before tenant allowances and incentives.

+ References

No definition available.

+ Details

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Namespace Prefix:	mstr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Date which lease or group of leases is set to expire, in YYYY-MM format.

+ References

No definition available.

+ Details

Name:	mstr_LeaseExpirationMonthYear
Namespace Prefix:	mstr_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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