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Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Accounting Policies [Abstract]    
Beginning Balance $ 194,951us-gaap_RedeemableNoncontrollingInterestEquityFairValue $ 148,534us-gaap_RedeemableNoncontrollingInterestEquityFairValue
Redemptions (1,729)mdca_RedeemableNoncontrollingInterestDecreaseFromRedemptions (4,820)mdca_RedeemableNoncontrollingInterestDecreaseFromRedemptions
Granted 5,704mdca_RedeemableNoncontrollingInterestsPeriodIncrease 13,327mdca_RedeemableNoncontrollingInterestsPeriodIncrease
Changes in redemption value 4,290mdca_ChangesInRedemptionValue 38,850mdca_ChangesInRedemptionValue
Currency Translation Adjustments (878)mdca_RedeemableNoncontrollingInterestCurrencyAdjustments (940)mdca_RedeemableNoncontrollingInterestCurrencyAdjustments
Ending Balance $ 202,338us-gaap_RedeemableNoncontrollingInterestEquityFairValue $ 194,951us-gaap_RedeemableNoncontrollingInterestEquityFairValue