Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Intangible Assets

Goodwill. The table below presents changes to the carrying amount of goodwill by segment during the two-year period ended December 31, 2025 (in thousands).

	Insights		Conferences		Consulting		Other		Total
Balance at December 31, 2023	$	2,460,448	$	183,997	$	95,714	$	197,101	$	2,937,260
Additions due to an acquisition
Foreign currency translation impact	(6,568)		(77)		(410)		—		(7,055)
Balance at December 31, 2024	2,453,880		183,920		95,304		197,101		2,930,205
Impairment loss (1)	—		—		—		(150,000)		(150,000)
Reclassified as held-for-sale (2)	—		—		—		(49,057)		(49,057)
Foreign currency translation impact	6,435		132		1,131		1,956		9,654
Balance at December 31, 2025	$	2,460,315	$	184,052	$	96,435	$	—	$	2,740,802
Accumulated impairment loss (1)	$	—	$	—	$	—	$	(150,000)	$	(150,000)

(1)The Company recognized an impairment loss of $150.0 million during the year ended December 31, 2025.

(2)Represents amounts reclassified to Assets held-for-sale due to the pending divestiture of the Company’s Digital Markets business. See Note 19 — Subsequent Events for additional information.

Finite-lived intangible assets. Changes in finite-lived intangible assets during the two-year period ended December 31, 2025 are presented in the tables below (in thousands).

December 31, 2025	Customer Relationships		Other		Total
Gross cost at December 31, 2024	1,071,917		10,200		$	1,082,117
Intangible assets fully amortized	(73,589)		—		(73,589)
Foreign currency translation impact	23,429		—		23,429
Gross cost	1,021,757		10,200		1,031,957
Accumulated amortization (1)	(687,416)		(8,238)		(695,654)
Balance at December 31, 2025	$	334,341	$	1,962	$	336,303

December 31, 2024	Customer Relationships		Technology-related		Other		Total
Gross cost at December 31, 2023	$	1,077,183	$	11,200	$	10,200	$	1,098,583
Intangible assets fully amortized	—		(11,200)		—		(11,200)
Foreign currency translation impact	(5,266)		—		—		(5,266)
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; Technology-related—3 to 7 years; and Other —11 years.

Amortization expense related to finite-lived intangible assets was $82.3 million, $90.2 million and $92.5 million in 2025, 2024 and 2023, respectively. The estimated future amortization expense by year for finite-lived intangible assets is presented in the table below (in thousands).

2026	$	80,193
2027	79,585
2028	78,114
2029	78,035
2030	20,376
	$	336,303