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New Accounting Pronouncements - Adoption of ASC 606 (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Services | $ 375,830 | $ 375,800 | $ 1,082,541 | $ 1,111,032
Cost of services sold | 238,690 | 249,418 | 735,110 | 754,803
Operating profit (loss) | 2,618 | 37,220 | 18,757 | 72,000
Net loss attributable to MDC Partners, Inc. common shareholders | $ (18,234) | $ 14,137 | $ (48,339) | $ 13,033
Loss per common share - basic and diluted (in USD per share) | $ (0.32) |  | $ (0.85) |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Services | $ 384,002 |  | $ 1,121,717 |
Cost of services sold | 252,812 |  | 783,193 |
Operating profit (loss) | (3,332) |  | 9,850 |
Net loss attributable to MDC Partners, Inc. common shareholders | $ (22,934) |  | $ (54,424) |
Loss per common share - basic and diluted (in USD per share) | $ (0.40) |  | $ (0.95) |
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] |  |  |  |
Services | $ 8,172 |  | $ 39,176 |
Cost of services sold | 14,122 |  | 48,083 |
Operating profit (loss) | (5,950) |  | (8,907) |
Net loss attributable to MDC Partners, Inc. common shareholders | $ (4,700) |  | $ (6,085) |
Loss per common share - basic and diluted (in USD per share) | $ (0.08) |  | $ (0.10) |

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