Segment Information - Reconciliation of U.S. GAAP Income (Loss) Before Income Taxes to Adjusted EBITDA (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Loss (gain) on mark-to-market adjustment of contingent consideration			$ (4,494)	$ 7,482
Interest income	$ 4,800	$ 1,700	11,700	2,000
Currency gains on acquisition-related intercompany loans			300
Currency losses on acquisition-related intercompany loans	2,800	6,800		13,700
World Programming [Member]
Segment Reporting Information [Line Items]
Loss (gain) on mark-to-market adjustment of contingent consideration			$ 4,500
Gain on mark-to-market adjustment of contingent consideration	$ 3,500	$ 2,200		7,500
Convertible Senior Notes Due in 2024 [Member]
Segment Reporting Information [Line Items]
Fair value expense recognized				$ 16,600