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Acquisitions (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Jan. 01, 2014
Feb. 14, 2014
Aug. 01, 2014
Aug. 18, 2014
Jun. 03, 2014
Jul. 31, 2014
Business Acquisition [Line Items]                    
Business Acquisition, Increase (Decrease) In Contingent Purchase Price Obligation $ 2,248mdca_BusinessAcquisitionIncreaseDecreaseInContingentPurchasePriceObligation $ 8,022mdca_BusinessAcquisitionIncreaseDecreaseInContingentPurchasePriceObligation                
Redeemable Noncontrolling Interest, Equity, Fair Value 202,338us-gaap_RedeemableNoncontrollingInterestEquityFairValue 194,951us-gaap_RedeemableNoncontrollingInterestEquityFairValue 194,951us-gaap_RedeemableNoncontrollingInterestEquityFairValue 148,534us-gaap_RedeemableNoncontrollingInterestEquityFairValue            
Noncontrolling Interest, Ownership Percentage by Parent 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent                  
Aggregate 2014 Acquisitions [Member]                    
Business Acquisition [Line Items]                    
Business Acquisition, Cost of Acquired Entity, Purchase Price     151,202mdca_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice1
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
             
Business Acquisition, Cost of Acquired Entity, Cash Paid     67,236us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
             
Business Acquisition, Deferred Acquisition Consideration     83,966mdca_BusinessAcquisitionDeferredAcquisitionConsideration
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
             
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets     61,906mdca_BusinessAcquisitionPurchasePriceAllocationAmortizedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
             
Business Acquisition, Purchase Price Allocation, Goodwill Amount     149,234mdca_BusinessAcquisitionPurchasePriceAllocationGoodwill
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
             
Nonredeemable Noncontrolling Interest     50,552us-gaap_NonredeemableNoncontrollingInterest
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
             
Redeemable Noncontrolling Interest, Equity, Fair Value     13,327us-gaap_RedeemableNoncontrollingInterestEquityFairValue
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
             
Business Acquisition Purchase Price Allocation Intangibles and Goodwill Expected Tax Deductible Amount     149,232mdca_BusinessAcquisitionPurchasePriceAllocationIntangiblesAndGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
             
Aggregate 2014 Acquisitions [Member] | Luntz Global Partners L L C                    
Business Acquisition [Line Items]                    
Business Acquisition, Percentage of Voting Interests Acquired         60.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
/ dei_LegalEntityAxis
= mdca_LuntzGlobalPartnersLLCMember
         
Aggregate 2014 Acquisitions [Member] | Kingsdale Partners LP                    
Business Acquisition [Line Items]                    
Business Acquisition, Percentage of Voting Interests Acquired           65.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
/ dei_LegalEntityAxis
= mdca_KingsdalePartnersLpMember
       
Aggregate 2014 Acquisitions [Member] | Hunter PR LLC [Member] [Domain]                    
Business Acquisition [Line Items]                    
Business Acquisition, Percentage of Voting Interests Acquired             65.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
/ dei_LegalEntityAxis
= mdca_HunterPRLLCMemberDomain
     
Aggregate 2014 Acquisitions [Member] | Albion Brand Communications Limited [Member] [Domain] [Domain]                    
Business Acquisition [Line Items]                    
Business Acquisition, Percentage of Voting Interests Acquired               75.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
/ dei_LegalEntityAxis
= mdca_AlbionBrandCommunicationsLimitedMemberDomainDomain
   
Aggregate 2014 Acquisitions [Member] | The House Worldwide Ltd [Member]                    
Business Acquisition [Line Items]                    
Business Acquisition, Percentage of Voting Interests Acquired                 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= mdca_Aggregate2014AcquisitionsMember
/ dei_LegalEntityAxis
= mdca_TheHouseWorldwideLtdMember
 
Trapeze Media Limited | Union Advertising Canada LC [Member]                    
Business Acquisition [Line Items]                    
Business Acquisition, Percentage of Voting Interests Acquired                   100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= mdca_TrapezeMediaLimitedMember
/ dei_LegalEntityAxis
= mdca_UnionAdvertisingCanadaLCMember
Union Advertising Canada LC [Member] | Trapeze Media Limited                    
Business Acquisition [Line Items]                    
Business Combination, Step Acquisition Gain on sale of ownership percentage     $ 908mdca_BusinessCombinationStepAcquisitionGainonsaleofownershippercentage
/ us-gaap_BusinessAcquisitionAxis
= mdca_TrapezeMediaLimitedMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mdca_UnionAdvertisingCanadaLCMember
             
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners                   18.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= mdca_TrapezeMediaLimitedMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mdca_UnionAdvertisingCanadaLCMember
Minimum [Member] | Aggregate 2014 Acquisitions [Member]                    
Business Acquisition [Line Items]                    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years                  
Maximum [Member] | Aggregate 2014 Acquisitions [Member]                    
Business Acquisition [Line Items]                    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 6 years