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Acquisitions (Details Textual) (USD $) In Thousands, unless otherwise specified |  | 12 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012 Aggregate Year to Date Acquisitions [Member]
Significant Acquisitions and Disposals, Description |  | During 2012, the Company completed a number of transactions. Effective March 28, 2012, MDC invested in Doner Partners LLC (Doner). The Company acquired a 30% voting interest and a convertible preferred interest that allows the Company to increase ordinary voting ownership to 70% at MDCs option, at no additional cost to the Company. Doner is a full service integrated creative agency. In addition, the Company acquired a 70% interest in TargetCast LLC (TargetCast). TargetCast is a full service media agency that expands our media strategy and activation offerings. The Company acquired a 51% interest in Dotbox LLC (Dotbox), and subsequently acquired the remaining 49% of the equity interests in Dotbox
Business Acquisition, Cost of Acquired Entity, Purchase Price |  | $ 99,299
Business Acquisition, Cost of Acquired Entity, Cash Paid |  | 23,471
Business Acquisition, Deferred Acquisition Consideration |  | 67,812
Business Acquisition, Working Capital Payments |  | 8,016
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets |  | 31,968
Business Acquisition, Purchase Price Allocation, Goodwill Amount |  | 113,404
Redeemable Noncontrolling Interest, Equity, Carrying Amount |  | 18,501
Business Acquisition Purchase Price Allocation Intangibles and Goodwill Expected Tax Deductible Amount |  | 145,372
Reduction to Short Term Noncontrolling Interest |  | 197
Decrease in Redeemable Noncontrolling Interest |  | 12,523
Step Up Adjustment to Paid in Capital |  | $ 13,920
Noncontrolling Interest, Ownership Percentage by Parent | 100.00% |

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