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Goodwill and Other Intangible Assets - Summary of Goodwill Balances by Component and Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Line Items]    
Balance, beginning $ 270,551 $ 254,022
Business acquisitions   8,154
Foreign currency translation adjustments (9,148) 8,375
Purchase price allocation adjustments (73)  
Balance, ending 261,330 270,551
GES U.S.    
Goodwill [Line Items]    
Balance, beginning 148,277 148,277
Balance, ending 148,277 148,277
GES International    
Goodwill [Line Items]    
Balance, beginning 38,840 34,460
Business acquisitions   1,060
Foreign currency translation adjustments (2,219) 3,320
Balance, ending 36,621 38,840
Pursuit    
Goodwill [Line Items]    
Balance, beginning 83,434 71,285
Business acquisitions   7,094
Foreign currency translation adjustments (6,929) 5,055
Purchase price allocation adjustments (73)  
Balance, ending $ 76,432 $ 83,434