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Significant Accounting Policies - Redeemable Noncontrolling Interest (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Redeemable Noncontrolling Interest [Roll Forward] |  |  |
Beginning Balance as of January 1, | $ 148,534 us-gaap_RedeemableNoncontrollingInterestEquityFairValue | $ 117,953 us-gaap_RedeemableNoncontrollingInterestEquityFairValue | $ 107,432 us-gaap_RedeemableNoncontrollingInterestEquityFairValue
Redemptions | (4,820)mdca_RedeemableNoncontrollingInterestDecreaseFromRedemptions | (4,270)mdca_RedeemableNoncontrollingInterestDecreaseFromRedemptions | (16,712)mdca_RedeemableNoncontrollingInterestDecreaseFromRedemptions
Granted | 13,327 mdca_RedeemableNoncontrollingInterestsPeriodIncrease | 0 mdca_RedeemableNoncontrollingInterestsPeriodIncrease | 4,189 mdca_RedeemableNoncontrollingInterestsPeriodIncrease
Changes in redemption value | 38,850 mdca_ChangesInRedemptionValue | 35,689 mdca_ChangesInRedemptionValue | 22,912 mdca_ChangesInRedemptionValue
Currency translation adjustments | (940)mdca_RedeemableNoncontrollingInterestCurrencyAdjustments | (838)mdca_RedeemableNoncontrollingInterestCurrencyAdjustments | 132 mdca_RedeemableNoncontrollingInterestCurrencyAdjustments
Ending Balance as of December 31, | $ 194,951 us-gaap_RedeemableNoncontrollingInterestEquityFairValue | $ 148,534 us-gaap_RedeemableNoncontrollingInterestEquityFairValue | $ 117,953 us-gaap_RedeemableNoncontrollingInterestEquityFairValue

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- Definition Changes in redemption value of noncontrolling interest. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Adjustments to redeemable noncontrolling interest resulting from foreign currency translation adjustments. + References No definition available. + Details
Name: | mdca_RedeemableNoncontrollingInterestCurrencyAdjustments
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Decrease in redeemable noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests). + References No definition available. + Details
Name: | mdca_RedeemableNoncontrollingInterestDecreaseFromRedemptions
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | mdca_RedeemableNoncontrollingInterestRollForward
Namespace Prefix: | mdca_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Redeemable noncontrolling interests increase during the period. + References No definition available. + Details
Name: | mdca_RedeemableNoncontrollingInterestsPeriodIncrease
Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant