Revenue and Related Contract Costs and Contract Liabilities - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue recognition description of capitalized contract costs	Capitalized contract costs are expensed upon the transfer of the related goods or services and are included in cost of services or cost of products, as applicable
Capitalized contract costs to obtain contracts	$ 900,000
Capitalized contract costs to fulfill contracts	$ 9,900,000
Impairment loss on capitalized contract costs		$ 0	$ 0
GES
Disaggregation Of Revenue [Line Items]
Performance obligation description of payment terms	Payment terms are generally within 30-60 days and contain no significant financing components
GES | Minimum [Member]
Disaggregation Of Revenue [Line Items]
Performance obligation payment terms	30 days
GES | Maximum
Disaggregation Of Revenue [Line Items]
Performance obligation payment terms	60 days
Pursuit
Disaggregation Of Revenue [Line Items]
Performance obligation description of payment terms	When credit is extended, payment terms are generally within 30 days and contain no significant financing components
Performance obligation payment terms	30 days