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Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Goodwill [Line Items]  
Balance, beginning $ 261,330
Business acquisitions 10,731
Foreign currency translation adjustments 2,857
Other adjustment 1,245
Balance, ending 276,163
GES North America  
Goodwill [Line Items]  
Balance, beginning 154,944
Foreign currency translation adjustments 280
Balance, ending 155,224
GES EMEA  
Goodwill [Line Items]  
Balance, beginning 29,954
Foreign currency translation adjustments (406)
Balance, ending 29,548
Pursuit  
Goodwill [Line Items]  
Balance, beginning 76,432
Business acquisitions 10,731
Foreign currency translation adjustments 2,983
Other adjustment 1,245
Balance, ending $ 91,391