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Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring Cost And Reserve [Line Items]    
Beginning balance $ 3,782  
Restructuring charges 394 $ 992
Cash payments (1,137)  
Adjustment to liability (193)  
Ending balance 2,846  
GES | Severance & Employee Benefits    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 2,274  
Restructuring charges 204  
Cash payments (649)  
Ending balance 1,829  
GES | Facilities    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 1,092  
Restructuring charges 53  
Cash payments (233)  
Ending balance 912  
Other Restructuring | Severance & Employee Benefits    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 416  
Restructuring charges 137  
Cash payments (255)  
Adjustment to liability (193)  
Ending balance $ 105