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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |
Beginning Balance | $ 835,935 | $ 844,759
Acquired goodwill | 37,592 | 0
Disposition |  | (17,593)
Impairment loss recognized | (74,560) | (3,238)
Transfer of goodwill between segments | 0 | 0
Transfer of goodwill to asset held for sale | (45,224) |
Foreign currency translation | (12,788) | 12,007
Ending Balance | 740,955 | 835,935
Media Services [Member] |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 160,057 | 176,686
Acquired goodwill | 0 | 0
Disposition |  | 16,629
Impairment loss recognized | (52,041) | (497)
Transfer of goodwill between segments | 3,773 | 497
Transfer of goodwill to asset held for sale | 0 |
Foreign currency translation | (443) | 0
Ending Balance | 111,346 | 160,057
All Other [Domain] |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 201,121 | 201,904
Acquired goodwill | 32,776 |
Disposition |  | 0
Impairment loss recognized | (4,691) | 0
Transfer of goodwill between segments | (22,920) | (6,868)
Transfer of goodwill to asset held for sale | (45,224) |
Foreign currency translation | (6,891) | 6,085
Ending Balance | 154,171 | 201,121
Global Integrated Agencies [Member] |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 359,071 | 350,716
Acquired goodwill | 0 | 0
Disposition |  | 964
Impairment loss recognized | (17,828) | (2,741)
Transfer of goodwill between segments | 17,081 | 6,371
Transfer of goodwill to asset held for sale | 0 |
Foreign currency translation | (5,169) | 5,689
Ending Balance | 353,155 | 359,071
Domestic Creative Agencies [Member] |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 36,980 | 36,762
Acquired goodwill | 0 | 0
Disposition |  | 0
Impairment loss recognized | 0 | 0
Transfer of goodwill between segments | 2,066 | 0
Transfer of goodwill to asset held for sale | 0 |
Foreign currency translation | (266) | 218
Ending Balance | 38,780 | 36,980
Specialist Communications [Member] |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 78,706 | 78,691
Acquired goodwill | 4,816 | 0
Disposition |  | 0
Impairment loss recognized | 0 | 0
Transfer of goodwill between segments | 0 | 0
Transfer of goodwill to asset held for sale | 0 |
Foreign currency translation | (19) | 15
Ending Balance | $ 83,503 | $ 78,706

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