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Commitments, Contingencies and Guarantees (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Put Obtains Upon Termination and Other | $ 102,089 |  |
Investment Commitments | 4,106 |  |
Letters of Credit Outstanding, Amount | 4,771 | 5,830 |
Estimated Payments for Purchase of Ownership Interest on Exercise of Put Options | 15,866 |  |
Estimated Issuance of Share Capital for Purchase of Ownership Interest on Exercise of Put Options | 1,414 |  |
Estimated Aggregate Amount For Purchase Of Ownership Interest On Exercise Of Put Options | 117,953 |  |
Operating Leases, Rent Expense | 35,935 | 26,554 | 18,429
Operating Leases, Income Statement, Sublease Revenue | 820 | 555 | 277
Accrued Sublease Income Receivable | $ 1,382 |  |

X
- Definition Sublease income earned but not yet received by the entity. + References No definition available. + Details
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Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated aggregate amount for purchase of ownership interest on exercise of put options. + References No definition available. + Details
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Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

X
- Definition Aggregate amount that is obliged by the company to pay for ownership rights in subsidiary, only upon termination of such owner's employment with the applicable subsidiary or death. + References No definition available. + Details
Name: | mdca_PutObtainsUponTerminationAndOther
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration