Segment Information - Reconciliation of U.S. GAAP (Loss) Income Before Income Taxes to Adjusted EBITDA (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Currency losses on acquisition-related intercompany loans		$ 6,800
Loss (gain) on mark-to-market adjustment of contingent consideration	$ 5,706	(7,153)	$ 0
Interest income	16,900	4,100	500
Currency gains on acquisition-related intercompany loans	$ 3,200		$ 1,200
World Programming [Member]
Segment Reporting Information [Line Items]
Loss (gain) on mark-to-market adjustment of contingent consideration		(7,200)
Convertible Senior Notes Due in 2024 [Member]
Segment Reporting Information [Line Items]
Fair value expense recognized		$ 16,600