Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes to the Carrying Amount of Goodwill by Reporting Unit

The table below presents changes to the carrying amount of goodwill by segment during the three months ended March 31, 2025 (in thousands).

	Research		Conferences		Consulting		Total
Balance at December 31, 2024 (1)	$	2,650,981	$	183,920	$	95,304	$	2,930,205
Foreign currency translation impact	2,447		38		432		2,917
Balance at March 31, 2025 (1)	$	2,653,428	$	183,958	$	95,736	$	2,933,122

(1)The Company does not have any accumulated goodwill impairment losses.

Schedule of Amortizable Intangible Assets

The tables below present reconciliations of the carrying amounts of the Company’s finite-lived intangible assets as of the dates indicated (in thousands).

March 31, 2025	Customer Relationships		Other		Total
Gross cost at December 31, 2024	$	1,071,917	$	10,200	$	1,082,117
Intangible assets fully amortized	(10,120)		—		(10,120)
Foreign currency translation impact	10,385		—		10,385
Gross cost	1,072,182		10,200		1,082,382
Accumulated amortization (1)	(683,046)		(7,532)		(690,578)
Balance at March 31, 2025	$	389,136	$	2,668	$	391,804

December 31, 2024	Customer Relationships		Other		Total
Gross cost	$	1,071,917	$	10,200	$	1,082,117
Accumulated amortization (1)	(665,131)		(7,297)		(672,428)
Balance at December 31, 2024	$	406,786	$	2,903	$	409,689

(1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—6 to 13 years and Other—11 years.

Schedule of Estimated Future Amortization Expense by Year

The estimated future amortization expense by year for finite-lived intangible assets is presented in the table below (in thousands).

2025 (remaining nine months)	$	59,776
2026	79,190
2027	78,582
2028	77,110
2029	77,032
2030	20,114
	$	391,804