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Acquisitions - Schedule of Net Income (Loss) Attributable to Parent and Transfers (to) from Noncontrolling Interest (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Combinations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Loss attributable to MDC Partners Inc. | $ (26,759)us-gaap_NetIncomeLoss | $ (4,922)us-gaap_NetIncomeLoss | $ 16,470 us-gaap_NetIncomeLoss | $ (8,846)us-gaap_NetIncomeLoss | $ (94,321)us-gaap_NetIncomeLoss | $ (21,200)us-gaap_NetIncomeLoss | $ 9,816 us-gaap_NetIncomeLoss | $ (43,158)us-gaap_NetIncomeLoss | $ (24,057)us-gaap_NetIncomeLoss | $ (148,863)us-gaap_NetIncomeLoss | $ (85,439)us-gaap_NetIncomeLoss
Transfers (to) from the noncontrolling interest |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of noncontrolling interests and redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (8,992)mdca_NonControllingInterestIncreaseDecreaseFromBusinessCombination | 11,074 mdca_NonControllingInterestIncreaseDecreaseFromBusinessCombination | 13,920 mdca_NonControllingInterestIncreaseDecreaseFromBusinessCombination
Net transfers from (to) noncontrolling interest |  |  |  |  |  |  |  |  | (8,992)mdca_NetTransfersToFromNonControllingInterest | 11,074 mdca_NetTransfersToFromNonControllingInterest | 13,920 mdca_NetTransfersToFromNonControllingInterest
Change from net loss attributable to MDC Partners Inc. and transfers from (to) noncontrolling interest |  |  |  |  |  |  |  |  | $ (33,049)mdca_NetIncomeLossIncludingTransfersFromNonControllingInterest | $ (137,789)mdca_NetIncomeLossIncludingTransfersFromNonControllingInterest | $ (71,519)mdca_NetIncomeLossIncludingTransfersFromNonControllingInterest

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent adjusted for transactions with noncontrolling interest holders. + References No definition available. + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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