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Income Taxes - Schedule of Changes in Tax Reserve (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Reserve [Roll Forward] |  |  |
Beginning Balance | $ 996 | $ 887 | $ 1,433
Current year positions | 581 | 275 | 0
Prior period positions | 0 | 0 | 7
Settlements | 0 | 0 | (314)
Lapse of statute of limitations | (170) | (166) | (239)
Ending Balance | $ 1,407 | $ 996 | $ 887

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- Definition Current Year Positions Changes in Reserve + References No definition available. + Details
Name: | mdca_CurrentYearPositionsChangesinReserve
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from all currently nondeductible expenses reflected in all reserves and accrued liabilities, which can only be deducted for tax purposes when relevant losses are realized or relevant obligations are actually incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References No definition available. + Details
Name: | mdca_IncomeTaxReserve
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Income Tax Reserve [Roll Forward] + References No definition available. + Details
Name: | mdca_IncomeTaxReserveRollForward
Namespace Prefix: | mdca_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lapse of statute of limitations + References No definition available. + Details
Name: | mdca_Lapseofstatuteoflimitations
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Prior Period Positions Changes in Reserve + References No definition available. + Details
Name: | mdca_PriorPeriodPositionsChangesinReserve
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Settlements of uncertainty expenses incurred during the period which resulted in a decrease in tax reserve. + References No definition available. + Details
Name: | mdca_SettlementOfUncertainty
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration