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Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Goodwill [Line Items]  
Balance, beginning $ 261,330
Foreign currency translation adjustments 1,582
Balance, ending 262,912
GES North America  
Goodwill [Line Items]  
Balance, beginning 154,944
Foreign currency translation adjustments 146
Balance, ending 155,090
GES EMEA  
Goodwill [Line Items]  
Balance, beginning 29,954
Foreign currency translation adjustments 170
Balance, ending 30,124
Pursuit  
Goodwill [Line Items]  
Balance, beginning 76,432
Foreign currency translation adjustments 1,266
Balance, ending $ 77,698