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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. + References No definition available. + Details
Name: | mdca_AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterest
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accrued and Other Liabilities Attributable To Noncontrolling Interest, Distributions Made + References 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

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- Definition Other transactions related to noncontrolling interest. + References 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