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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Amounts Due to Noncontrolling Interest (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Noncontrolling Interest [Abstract]
Beginning balance	$ 20,704	$ 14,028
Income attributable to noncontrolling interests		21,774
Distributions made	(20,855)	(15,192)
Other	165	94
Ending balance	$ 12,736	$ 20,704

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- Definition

Carrying value as of the balance sheet date of accrued and other liabilities attributable to noncontrolling interest during the reporting period.

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No definition available.

+ Details

Name:	mdca_AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterest
Namespace Prefix:	mdca_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Accrued and Other Liabilities Attributable To Noncontrolling Interest, Distributions Made

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No definition available.

+ Details

Name:	mdca_AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterestDistributionsMade
Namespace Prefix:	mdca_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Accrued Net Income (Loss) Attributable to Noncontrolling Interest

+ References

No definition available.

+ Details

Name:	mdca_AccruedNetIncomeLossAttributableToNoncontrollingInterest
Namespace Prefix:	mdca_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Other transactions related to noncontrolling interest.

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No definition available.

+ Details

Name:	mdca_AdjustmentsToNoncontrollingInterest
Namespace Prefix:	mdca_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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