Revenues - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Accounts receivable, net	$ 91,744		$ 91,744		$ 106,812
Unearned income	22,103		22,103		20,668
Unearned income - long term	28,679		28,679		$ 28,437
Revenue recognized that was included in unearned income	4,000	$ 5,200	9,200	$ 11,300
Transaction price allocated to performance obligations that are unsatisfied or partially satisfied	$ 322,500		$ 322,500
Professional Services, All Other Contracts | Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, period of expected timing of satisfaction	2 years		2 years
Professional Services, All Other Contracts | Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, period of expected timing of satisfaction	5 years		5 years