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New Accounting Pronouncements - Adoption of ASC 606 (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenue - Services | $ 379,743 | $ 390,532 | $ 706,711 | $ 735,232
Cost of services sold | 253,390 | 267,822 | 496,420 | 505,385
Operating profit (loss) | 30,772 | 26,381 | 16,139 | 34,780
Net loss attributable to MDC Partners, Inc. common shareholders | 1,133 | $ 7,960 | $ (30,105) | $ (1,730)
Loss per common share - basic and diluted (in USD per share) |  |  | $ (0.53) |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Revenue - Services | 389,471 |  | $ 737,715 |
Cost of services sold | 272,154 |  | 530,381 |
Operating profit (loss) | 21,736 |  | 13,182 |
Net loss attributable to MDC Partners, Inc. common shareholders | $ (4,483) |  | $ (31,490) |
Loss per common share - basic and diluted (in USD per share) | $ (0.08) |  | $ (0.55) |
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 | $ 9,728 |  | $ 31,004 |
Cost of services sold | 18,764 |  | 33,961 |
Operating profit (loss) | (9,036) |  | (2,957) |
Net loss attributable to MDC Partners, Inc. common shareholders | $ (5,616) |  | $ (1,385) |
Loss per common share - basic and diluted (in USD per share) | $ (0.10) |  | $ (0.02) |

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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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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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