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New Accounting Pronouncements - Adoption of ASC 606 (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue - Services | $ 326,968 | $ 344,700
Cost of services sold | 243,030 | 237,563
Operating profit (loss) | (14,633) | 8,399
Net loss attributable to MDC Partners, Inc. common shareholders | $ (31,443) | $ (11,073)
Loss per common share - basic and diluted (in USD per share) | $ (0.56) | $ (0.21)
Calculated under Revenue Guidance in Effect before Topic 606 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue - Services | $ 348,244 |
Cost of services sold | 258,227 |
Operating profit (loss) | (8,554) |
Net loss attributable to MDC Partners, Inc. common shareholders | $ (27,007) |
Loss per common share - basic and diluted (in USD per share) | $ (0.48) |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue - Services | $ 21,276 |
Cost of services sold | 15,197 |
Operating profit (loss) | 6,079 |
Net loss attributable to MDC Partners, Inc. common shareholders | $ 4,436 |
Loss per common share - basic and diluted (in USD per share) | $ 0.08 |

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- Definition Total costs related to services rendered by an entity during the reporting period. + 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 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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