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Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 302,222us-gaap_SalesRevenueServicesNet	$ 274,854us-gaap_SalesRevenueServicesNet
Other Segments
Segment Reporting Information [Line Items]
Revenue	20,379us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	15,108us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
United States
Segment Reporting Information [Line Items]
Revenue	252,018us-gaap_SalesRevenueServicesNet / mdca_AllCountriesAxis = country_US	228,833us-gaap_SalesRevenueServicesNet / mdca_AllCountriesAxis = country_US
Canada
Segment Reporting Information [Line Items]
Revenue	$ 29,825us-gaap_SalesRevenueServicesNet / mdca_AllCountriesAxis = country_CA	$ 30,913us-gaap_SalesRevenueServicesNet / mdca_AllCountriesAxis = country_CA

X

- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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- Details

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