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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost And Reserve [Line Items]
Beginning balance			$ 2,549
Restructuring charges	$ 662	$ 168	824	$ 562
Cash payments			(1,027)
Adjustment to liability			(28)
Ending balance	2,318		2,318
GES \| Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance			1,551
Restructuring charges			694
Cash payments			(694)
Adjustment to liability			437
Ending balance	1,988		1,988
GES \| Facilities
Restructuring Cost And Reserve [Line Items]
Beginning balance			807
Cash payments			(38)
Adjustment to liability			(451)
Ending balance	318		318
Other Restructuring \| Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance			191
Restructuring charges			130
Cash payments			(295)
Adjustment to liability			(14)
Ending balance	$ 12		$ 12