Revenues - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Accounts receivable, net	$ 111,852		$ 111,852		$ 106,812
Unearned income	19,800		19,800		20,668
Unearned income - long term	30,827		30,827		$ 28,437
Revenue recognized that was included in unearned income	3,900	$ 1,800	13,100	$ 13,100
Transaction price allocated to performance obligations that are unsatisfied or partially satisfied	$ 307,100		$ 307,100
Professional Services, All Other Contracts | Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, period of expected timing of satisfaction (in years)	2 years		2 years
Professional Services, All Other Contracts | Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, period of expected timing of satisfaction (in years)	5 years		5 years