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Commitments, Contingencies and Guarantees - Textual (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract] |  |  |
Estimated payments for put option excluding termination | $ 19,722 mdca_EstimatedPaymentsForPutOptionExcludingTermination |  |
Estimated issuance of share capital for purchase of ownership interest on exercise of put options | 103 mdca_EstimatedIssuanceOfShareCapitalForPurchaseOfOwnershipInterestOnExerciseOfPutOptions |  |
Estimated payment for put options upon termination | 175,229 mdca_EstimatedPaymentForPutOptionsUponTermination |  |
Estimated aggregate amount for put options | 194,951 mdca_EstimatedAggregateAmountForPutOptions |  |
Letters of credit outstanding, amount | 4,822 us-gaap_LettersOfCreditOutstandingAmount |  |
Investment commitments | 10,209 mdca_InvestmentCommitments |  |
Operating leases, rent expense | 42,657 us-gaap_LeaseAndRentalExpense | 38,366 us-gaap_LeaseAndRentalExpense | 34,422 us-gaap_LeaseAndRentalExpense
Operating leases, income statement, sublease revenue | 1,449 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue | 897 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue | 820 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue
Future sublease income receivable | $ 10,741 mdca_FutureSubleaseIncomeReceivable |  |

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- Definition The estimated aggregate amount for put options has been recorded as on the reporting period. + References No definition available. + Details
Name: | mdca_EstimatedAggregateAmountForPutOptions
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated issuance of share capital to purchase ownership interests on exercise of put options. + References No definition available. + Details
Name: | mdca_EstimatedIssuanceOfShareCapitalForPurchaseOfOwnershipInterestOnExerciseOfPutOptions
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The estimated payment for put options upon termination has been recorded as on the reporting period. + References No definition available. + Details
Name: | mdca_EstimatedPaymentForPutOptionsUponTermination
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated payments for put option excluding termination as on the reporting period. + References No definition available. + Details
Name: | mdca_EstimatedPaymentsForPutOptionExcludingTermination
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total future cash expected to be received. + References No definition available. + Details
Name: | mdca_FutureSubleaseIncomeReceivable
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of fund to be committed towards investments. + References No definition available. + Details
Name: | mdca_InvestmentCommitments
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of revenue recognized for the period under subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6584307&loc=d3e41620-112719 + Details
Name: | us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration