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Overview and Basis of Presentation - Schedule of Corrections to Prior Period Adjustments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Total revenue $ 61,233 $ 30,067 $ 90,168 $ 324,725
Services        
Total revenue 46,306 25,409 71,206 289,615
Costs and expenses 76,052 68,584 132,420 341,636
Cost of Services        
Costs and expenses   68,584   341,636
GES        
Total revenue $ 24,920 24,803 $ 44,065 305,938
Previously Reported | Services        
Total revenue   26,205   301,761
Previously Reported | Cost of Services        
Costs and expenses   69,380   353,782
Revision of Prior Period, Error Correction, Adjustment | GES | Services        
Total revenue   (796)   (12,146)
Revision of Prior Period, Error Correction, Adjustment | GES | Cost of Services        
Costs and expenses   $ (796)   $ (12,146)