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Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]
Beginning balance				$ 2,549				$ 3,782	$ 2,549	$ 3,782	$ 2,276
Restructuring charges	$ 588	$ 175	$ 662	162	$ 187	$ 255	$ 168	394	1,587	1,004	5,183
Cash payments									(1,716)	(2,253)	(3,866)
Adjustment to liability									(169)	16	189
Ending balance	2,251				2,549				2,251	2,549	3,782
GES | Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance				1,551				2,274	1,551	2,274	751
Restructuring charges									1,457	442	3,693
Cash payments									(1,379)	(1,165)	(2,170)
Adjustment to liability									410
Ending balance	2,039				1,551				2,039	1,551	2,274
GES | Facilities
Restructuring Cost And Reserve [Line Items]
Beginning balance				807				1,092	807	1,092	1,291
Restructuring charges										265	759
Cash payments									(156)	(550)	(1,150)
Adjustment to liability									(451)		192
Ending balance	200				807				200	807	1,092
Other Restructuring | Severance & Employee Benefits
Restructuring Cost And Reserve [Line Items]
Beginning balance				$ 191				$ 416	191	416	234
Restructuring charges									130	297	731
Cash payments									(181)	(538)	(546)
Adjustment to liability									(128)	16	(3)
Ending balance	$ 12				$ 191				$ 12	$ 191	$ 416

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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