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Accruals and Other Liabilities (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Accrued and Other Liabilities [Abstract] |  |  |
Accrued Media Cost, Current | $ 192,473 | $ 168,508 |
Accrued and Other Liabilities Attributable To Noncontrolling Interest | $ 3,853 | $ 6,014 | $ 5,210

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

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