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Related Party Transactions - Relationship with Apollo Global Management, LLC (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) director	Jun. 30, 2018 USD ($)
Related-Party Transactions
Related party expense	$ 1,055	$ 1,402	$ 2,050	$ 2,508
Apollo
Related-Party Transactions
Number of directors right to designate \| director			2
Management Holdings \| Master Service Agreement [Member]
Related-Party Transactions
Revenue from related parties	200	200	$ 300	300
Caesars \| Master Service Agreement [Member]
Related-Party Transactions
Revenue from related parties	1,100	1,000	2,200	2,000
ADT LLC \| Master Service Agreement [Member]
Related-Party Transactions
Revenue from related parties	300	100	600	200
Diamond Resorts Centralized Services \| Master Service Agreement [Member]
Related-Party Transactions
Revenue from related parties	900	1,700	2,600	4,200
Related party cost of revenue			100	100
Novitex Solutions \| Presidio Group \| Master Service Agreement [Member]
Related-Party Transactions
Related party expense	$ 200	$ 200	$ 400	$ 300