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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, 2017
USD ($)
Goodwill [Line Items]  
Balance at December 31, 2016 $ 254,022
Foreign currency translation adjustments 1,179
Balance at March 31, 2017 255,201
GES U.S.  
Goodwill [Line Items]  
Balance at December 31, 2016 148,277
Balance at March 31, 2017 148,277
GES International  
Goodwill [Line Items]  
Balance at December 31, 2016 34,460
Foreign currency translation adjustments 502
Balance at March 31, 2017 34,962
Pursuit  
Goodwill [Line Items]  
Balance at December 31, 2016 71,285
Foreign currency translation adjustments 677
Balance at March 31, 2017 $ 71,962