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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost And Reserve [Line Items]
Beginning balance			$ 4,513
Restructuring charges	$ 260	$ 4,455	1,111	$ 5,143
Cash payments			(2,359)
Adjustment to liability			(118)
Ending balance	3,147		3,147
GES \| Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance			2,935
Restructuring charges			746
Cash payments			(1,534)
Adjustment to liability			(53)
Ending balance	2,094		2,094
GES \| Facilities
Restructuring Cost And Reserve [Line Items]
Beginning balance			1,339
Restructuring charges			(61)
Cash payments			(442)
Adjustment to liability			(27)
Ending balance	809		809
Other Restructuring \| Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance			239
Restructuring charges			426
Cash payments			(383)
Adjustment to liability			(38)
Ending balance	$ 244		$ 244