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Accruals and Other Liabilities (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Accrued and Other Liabilities [Abstract] |  |  |
Accrued media | $ 173,222 | $ 207,482 |
Amounts due to noncontrolling interest holders for their share of profits | 6,716 | 11,030 | $ 4,154
Outstanding checks | $ 54,320 | $ 41,989 |

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

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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
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Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
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- Definition Accrued Media Cost, Current + References No definition available. + Details
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Namespace Prefix: | mdca_
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Balance Type: | credit
Period Type: | instant

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- Definition Outstanding Checks + References No definition available. + Details
Name: | mdca_OutstandingChecks
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant