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v3.21.1

Leases - Additional Information (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($) lease
Leases [Abstract] |
Number of leases not yet commenced | lease | 5
Leases not yet commenced, liability | $ 34,020
Impairment of right-of-use asset and accelerated operating expenses | $ 875

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- Definition Impairment of Right-Of-Use Asset And Accelerated Operating Expenses + References No definition available. + Details
Name: | mdca_ImpairmentOfRightOfUseAssetAndAcceleratedOperatingExpenses
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Lessee, Operating Lease, Lease Not yet Commenced, Number of Contracts + References No definition available. + Details
Name: | mdca_LesseeOperatingLeaseLeaseNotYetCommencedNumberOfContracts
Namespace Prefix: | mdca_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Lessee, Operating Lease, Lease Not yet Commenced, Liability + References No definition available. + Details
Name: | mdca_LesseeOperatingLeaseLeaseNotyetCommencedLiability
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration