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Overview and Basis of Presentation - Schedule of Corrections to Prior Period Adjustments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Total revenue $ 28,935 $ 294,658
Services    
Total revenue 24,900 264,206
Costs and expenses 56,368 273,052
Cost of Services    
Costs and expenses   273,052
GES    
Total revenue $ 19,145 281,135
Previously Reported | Services    
Total revenue   275,556
Previously Reported | Cost of Services    
Costs and expenses   284,402
Revision of Prior Period, Error Correction, Adjustment | GES | Services    
Total revenue   (11,350)
Revision of Prior Period, Error Correction, Adjustment | GES | Cost of Services    
Costs and expenses   $ (11,350)