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Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Restructuring Cost And Reserve [Line Items]        
Beginning balance     $ 3,012  
Restructuring (recoveries) charges $ (825) $ 192 (709) [1] $ 645
Cash payments     (693)  
Adjustment to liability     (7)  
Ending balance 1,603   1,603  
GES | Severance & Employee Benefits        
Restructuring Cost And Reserve [Line Items]        
Beginning balance     1,634  
Restructuring (recoveries) charges [1]     (1,027)  
Cash payments     (462)  
Adjustment to liability     0  
Ending balance 145   145  
GES | Facilities        
Restructuring Cost And Reserve [Line Items]        
Beginning balance     1,378  
Restructuring (recoveries) charges [1]     317  
Cash payments     (231)  
Adjustment to liability     (6)  
Ending balance 1,458   1,458  
Other Restructuring | Severance & Employee Benefits        
Restructuring Cost And Reserve [Line Items]        
Beginning balance     0  
Restructuring (recoveries) charges [1]     1  
Cash payments     0  
Adjustment to liability     (1)  
Ending balance $ 0   $ 0  
[1] During the three months ended June 30, 2024, we reversed a prior year accrual of $1.5 million related to a certain multi-employer pension fund.