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Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost And Reserve [Line Items]
Beginning balance			$ 2,251
Restructuring charges	$ 1,702	$ 175	6,845	$ 999
Cash payments			(5,161)
Adjustment to liability			18
Ending balance	3,953		3,953
GES \| Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance			2,039
Restructuring charges			5,243
Cash payments			(4,428)
Adjustment to liability			(45)
Ending balance	2,809		2,809
GES \| Facilities
Restructuring Cost And Reserve [Line Items]
Beginning balance			200
Restructuring charges			1,397
Cash payments			(513)
Adjustment to liability			56
Ending balance	1,140		1,140
Other Restructuring \| Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance			12
Restructuring charges			205
Cash payments			(220)
Adjustment to liability			7
Ending balance	$ 4		$ 4