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Goodwill and Intangible Assets - Textual (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) reportable_segment | Dec. 31, 2017 USD ($) reportable_segment | Dec. 31, 2016 USD ($) reportable_segment
Goodwill [Line Items] |  |  |  |
Asset Impairment Charges | $ 56,732,000 | $ 80,057,000 | $ 4,415,000 | $ 48,524,000
Number of Reporting Units | reportable_segment |  | 3 | 2 | 3
Goodwill, impaired, accumulated impairment loss | $ 173,205,000 | $ 173,205,000 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 7 years |  |
Amortization of intangibles |  | $ 19,085,000 | $ 19,601,000 | $ 24,153,000
Amortization Of Intangible Assets, Finite Lived |  |  | $ 17,125,000 | $ 21,726,000
Trademarks [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | $ 3,180,000 |  |
Customer Relationships |  |  |  |
Goodwill [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 6 years |  |
Other Intangible Assets |  |  |  |
Goodwill [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 8 years |  |
Global Integrated Agencies [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Number of Reporting Units | reportable_segment |  | 1 | 1 |
Media Services [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Number of Reporting Units | reportable_segment |  | 1 | 1 |
All Other [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Number of Reporting Units | reportable_segment |  | 1 |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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