Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Beginning balance	$ 1,591,474	$ 1,531,455
Goodwill acquired (Note 4)	6,451	95,737
Goodwill impairment	(56,850)	(27,369)	$ (32,629)
Purchase accounting adjustments	(72)	4,338
Foreign exchange translation	5,062	(12,687)
Ending balance	1,546,065	1,591,474	1,531,455
Reportable segments | Digital Media
Goodwill [Roll Forward]
Beginning balance	1,065,989	996,659
Goodwill acquired (Note 4)	6,451	95,737
Goodwill impairment	(56,850)	(27,369)
Purchase accounting adjustments	(72)	4,475
Foreign exchange translation	1,362	(3,513)
Ending balance	1,016,880	1,065,989	996,659
Reportable segments | Cybersecurity and Martech
Goodwill [Roll Forward]
Beginning balance	525,485	534,796
Goodwill acquired (Note 4)	0	0
Goodwill impairment	0	0
Purchase accounting adjustments	0	(137)
Foreign exchange translation	3,700	(9,174)
Ending balance	$ 529,185	$ 525,485	$ 534,796