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