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Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Restructuring Cost And Reserve [Line Items]    
Beginning balance $ 3,435  
Restructuring charges 654 $ 2,826
Cash payments (564)  
Non-cash items [1] (355)  
Adjustment to liability 38  
Ending balance 3,208  
GES | Severance & Employee Benefits    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 1,976  
Restructuring charges 229  
Cash payments (82)  
Non-cash items [1] (355)  
Adjustment to liability (2)  
Ending balance 1,766  
GES | Facilities    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 1,433  
Restructuring charges 425  
Cash payments (429)  
Adjustment to liability 1  
Ending balance 1,430  
Other Restructuring | Severance & Employee Benefits    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 26  
Cash payments (53)  
Adjustment to liability 39  
Ending balance $ 12  
[1] Represents non-cash adjustments related to a write-down of certain ROU assets as a result of vacating certain facilities prior to the lease term during the three months ended March 31, 2022.