Segment Information - Reconciliation of U.S. GAAP Income (Loss) Before Income Taxes to Adjusted EBITDA (Parenthetical) (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Currency losses on acquisition-related intercompany loans	$ 5,400,000	$ 6,900,000
Gain On Mark To Market Adjustment Of Contingent Consideration		(5,304,000)	$ 0
World Programming [Member]
Segment Reporting Information [Line Items]
Gain On Mark To Market Adjustment Of Contingent Consideration	5,300,000	5,300,000
Convertible Senior Notes Due in 2024 [Member]
Segment Reporting Information [Line Items]
Expense on repurchase of convertible senior notes	$ 16,600,000	$ 16,600,000