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Quarterly Results of Operations - Textual (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Foreign exchange gain (loss) | $ 13,324,000 | $ 660,000 |  | $ 23,258,000 | $ (18,137,000) | $ 213,000
Cost of services sold | 1,534,000 | 7,480,000 |  | 18,416,000 | 24,350,000 | 21,003,000
Income attributable to fair value adjustments |  |  |  | (374,000) | (4,819,000) | 8,227,000
Asset Impairment Charges | 56,732,000 |  |  | 80,057,000 | 4,415,000 | $ 48,524,000
Goodwill, Impairment Loss |  |  |  | 74,560,000 | 3,238,000 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 49,447,000 | 226,466,000 |  |  |  |
Contingent Payment [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Income attributable to fair value adjustments | $ 8,979,000 | 18,173,000 |  | (3,679,000) | (6,021,000) |
All Other [Domain] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | $ 4,691,000 | $ 0 |
Experiential and Non-material [Member] |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Goodwill, Impairment Loss |  | $ 18,893,000 | $ 29,631,000 |  |  |

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