Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 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 nine months ended September 30, 2025 (in thousands).

	Insights		Conferences		Consulting		Other		Total
Balance at December 31, 2024	$	2,453,880	$	183,920	$	95,304	$	197,101	$	2,930,205
Impairment loss (1)	—		—		—		(150,000)		(150,000)
Foreign currency translation impact	6,273		135		1,198		2,112		9,718
Balance at September 30, 2025 (1)	$	2,460,153	$	184,055	$	96,502	$	49,213	$	2,789,923
Accumulated impairment loss (1)	$	—	$	—	$	—	$	(150,000)	$	(150,000)

(1)The Company recognized an impairment loss of $150.0 million during the three and nine months ended September 30, 2025.

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).

September 30, 2025	Customer Relationships		Other		Total
Gross cost at December 31, 2024	$	1,071,917	$	10,200	$	1,082,117
Intangible assets fully amortized	(70,120)		—		(70,120)
Foreign currency translation impact	25,393		—		25,393
Gross cost	1,027,190		10,200		1,037,390
Accumulated amortization (1)	(672,354)		(8,003)		(680,357)
Balance at September 30, 2025	$	354,836	$	2,197	$	357,033

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 three months)	$	20,086
2026	80,345
2027	79,736
2028	78,265
2029	78,186
2030	20,415
	$	357,033