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Acquisitions - Textual (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2014 | Dec. 31, 2014 | Mar. 28, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jul. 31, 2014 | Jan. 01, 2014 | Feb. 14, 2014 | Jun. 03, 2014 | Aug. 01, 2014 | Aug. 18, 2014 | Mar. 14, 2012 | Oct. 15, 2012 | Mar. 10, 2012
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma revenue | $ 56,733 us-gaap_BusinessAcquisitionsProFormaRevenue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma net income (loss) | 2,940 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired |  | 8,156 us-gaap_OtherPaymentsToAcquireBusinesses |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable acquired |  | 19,955 mdca_BusinessAcquisitionPurchasePriceAllocationAccountsReceivable |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities acquired |  | 9,295 mdca_BusinessAcquisitionPurchasePriceAllocationAccountsPayableAndAccruedLiabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interests |  | 194,951 us-gaap_RedeemableNoncontrollingInterestEquityFairValue |  | 148,534 us-gaap_RedeemableNoncontrollingInterestEquityFairValue | 117,953 us-gaap_RedeemableNoncontrollingInterestEquityFairValue | 107,432 us-gaap_RedeemableNoncontrollingInterestEquityFairValue |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent |  |  |  |  |  |  |  |  |  |  |  |  |
Doner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest entity, qualitative or quantitative information, ownership percentage |  |  | 30.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mdca_DonerMember |  |  |  |  |  |  |  |  |  |  |  |
Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, purchase price |  | 151,202 mdca_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice1 / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, cash paid |  | 67,236 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  | 83,966 mdca_BusinessAcquisitionDeferredAcquisitionConsideration / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  | 61,906 mdca_BusinessAcquisitionPurchasePriceAllocationAmortizedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill amount |  | 149,234 mdca_BusinessAcquisitionPurchasePriceAllocationGoodwill / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Nonredeemable noncontrolling interest |  | 50,552 us-gaap_NonredeemableNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interests |  | 13,327 us-gaap_RedeemableNoncontrollingInterestEquityFairValue / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles and goodwill, expected tax deductible amount |  | 149,232 mdca_BusinessAcquisitionPurchasePriceAllocationIntangiblesAndGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate 2014 Acquisitions | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets amortization period (years) |  | 5 years |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Aggregate 2014 Acquisitions | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets amortization period (years) |  | 6 years |  | 6 years |  |  |  |  |  |  |  |  |  |  |
Trapeze Media Limited | Union Advertising Canada LC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Step acquisition gain on sale of ownership percentage |  | 908 mdca_BusinessCombinationStepAcquisitionGainonsaleofownershippercentage / us-gaap_BusinessAcquisitionAxis = mdca_TrapezeMediaLimitedMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mdca_UnionAdvertisingCanadaLCMember |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  |  |  |  |  | 18.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = mdca_TrapezeMediaLimitedMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mdca_UnionAdvertisingCanadaLCMember |  |  |  |  |  |  |  |
Aggregate 2013 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, purchase price |  |  |  | 35,591 mdca_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice1 / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2013AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, cash paid |  |  |  | 12,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2013AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  | 23,591 mdca_BusinessAcquisitionDeferredAcquisitionConsideration / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2013AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  | 10,961 mdca_BusinessAcquisitionPurchasePriceAllocationAmortizedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2013AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |
Goodwill amount |  |  |  | 32,786 mdca_BusinessAcquisitionPurchasePriceAllocationGoodwill / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2013AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |
Intangibles and goodwill, expected tax deductible amount |  |  |  | 43,747 mdca_BusinessAcquisitionPurchasePriceAllocationIntangiblesAndGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2013AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest carrying amount |  |  |  | 10,657 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2013AcquisitionsMember |  |  |  |  |  |  |  |  |  |  |
Aggregate 2012 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, purchase price |  |  |  |  | 99,299 mdca_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice1 / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, cash paid |  |  |  |  | 23,471 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  |  | 67,812 mdca_BusinessAcquisitionDeferredAcquisitionConsideration / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember |  |  |  |  |  |  |  |  |  |
Amortizable intangible assets |  |  |  |  | 31,968 mdca_BusinessAcquisitionPurchasePriceAllocationAmortizedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember |  |  |  |  |  |  |  |  |  |
Goodwill amount |  |  |  |  | 113,404 mdca_BusinessAcquisitionPurchasePriceAllocationGoodwill / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember |  |  |  |  |  |  |  |  |  |
Intangibles and goodwill, expected tax deductible amount |  |  |  |  | 145,372 mdca_BusinessAcquisitionPurchasePriceAllocationIntangiblesAndGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember |  |  |  |  |  |  |  |  |  |
Noncontrolling interest carrying amount |  |  |  |  | 18,501 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember |  |  |  |  |  |  |  |  |  |
Working capital payments |  |  |  |  | 8,016 mdca_BusinessAcquisitionWorkingCapitalPayments / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember |  |  |  |  |  |  |  |  |  |
Reduction to short term noncontrolling interest |  |  |  |  | 197 mdca_ReductionToShortTermNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember |  |  |  |  |  |  |  |  |  |
Decrease in redeemable noncontrolling interest |  |  |  |  | 12,523 mdca_DecreaseInRedeemableNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember |  |  |  |  |  |  |  |  |  |
Step up adjustment to paid in capital |  |  |  |  | $ 13,920 mdca_StepUpAdjustmentToPaidInCapital / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember |  |  |  |  |  |  |  |  |  |
Aggregate 2012 Acquisitions | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets amortization period (years) |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Aggregate 2012 Acquisitions | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets amortization period (years) |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Luntz Global Partners LLC | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  | 60.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember / dei_LegalEntityAxis = mdca_LuntzGlobalPartnersLLCMember |  |  |  |  |  |  |
Kingsdale Partners, LP | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  | 65.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember / dei_LegalEntityAxis = mdca_KingsdalePartnersLpMember |  |  |  |  |  |
The House Worldwide Ltd | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember / dei_LegalEntityAxis = mdca_TheHouseWorldwideLtdMember |  |  |  |  |
Hunter PR LLC | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  | 65.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember / dei_LegalEntityAxis = mdca_HunterPRLLCMemberDomain |  |  |  |
Albion Brand Communications Limited | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  | 75.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2014AcquisitionsMember / dei_LegalEntityAxis = mdca_AlbionBrandCommunicationsLimitedMemberDomainDomain |  |  |
Local Biz Now | Aggregate 2013 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  | 70.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2013AcquisitionsMember / dei_LegalEntityAxis = mdca_LocalBizNowLlcMember |  |  |  |  |  |  |  |  |  |  |
Doner | Aggregate 2012 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 70.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember / dei_LegalEntityAxis = mdca_DonerMember |  |  |  |  |  |  |  |  |  |  |  |
TargetCast | Aggregate 2012 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  |  | 70.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember / dei_LegalEntityAxis = mdca_TargetCastLLCMember |  |
Dotbox | Aggregate 2012 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember / dei_LegalEntityAxis = mdca_DotboxLLCMember
Equity interest in acquiree, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage / us-gaap_BusinessAcquisitionAxis = mdca_Aggregate2012AcquisitionsMember / dei_LegalEntityAxis = mdca_DotboxLLCMember |

X
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- Definition The amount of acquisition cost of a business combination allocated to accounts payable and accrued liabilities of the acquired entity. + References No definition available. + Details
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- Definition The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with other payments to acquire businesses including deposit on pending acquisitions and preacquisition costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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