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Leases - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Leases [Abstract] |  |  |
Leases not yet commenced, liability | $ 12,677,000 |  | $ 12,677,000
Impairment of right-of-use asset | $ 1,933 | $ 5,777 | $ 1,933

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

X
- 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

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