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Goodwill and Intangible Assets - Textual (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) reportable_segment | Dec. 31, 2018 USD ($) reportable_segment | Dec. 31, 2017 USD ($) reportable_segment
Goodwill [Line Items] |  |  |  |  |
Goodwill and other asset impairment | $ 5,875 | $ 56,732 | $ 7,819 | $ 80,057 | $ 4,415
Number of Reporting Units | reportable_segment |  |  |  | 3 | 2
Goodwill, Impairment Loss |  |  | 4,099 | $ 74,560 |
Goodwill, impaired, accumulated impairment loss | $ 177,304 | $ 173,205 | $ 177,304 | 173,205 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 8 years |  |
Amortization Of Intangible Assets, Finite Lived |  |  | $ 11,828 | $ 17,290 | $ 17,125
Customer Relationships |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 7 years |  |
Other Intangible Assets |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 9 years |  |
Global Integrated Agencies |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Number of Reporting Units | reportable_segment |  |  |  | 1 | 1
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  | $ 3,180 |
Media Services |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Number of Reporting Units | reportable_segment |  |  |  | 1 | 1
All Other |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Number of Reporting Units | reportable_segment |  |  | 1 |  |

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