Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Restructuring Cost And Reserve [Line Items]
Beginning balance	$ 3,439
Restructuring charges	453	$ 654
Cash payments	(508)
Adjustment to liability	13
Ending balance	3,397
GES | Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance	1,609
Restructuring charges	135
Cash payments	(205)
Adjustment to liability	0
Ending balance	1,539
GES | Facilities
Restructuring Cost And Reserve [Line Items]
Beginning balance	1,818
Restructuring charges	311
Cash payments	(289)
Adjustment to liability	18
Ending balance	1,858
Other Restructuring | Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance	12
Restructuring charges	7
Cash payments	(14)
Adjustment to liability	(5)
Ending balance	$ 0