XML 26 R11.htm IDEA: XBRL DOCUMENT v3.25.0.1
Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2024
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, 2024 (in thousands).
 ResearchConferencesConsultingTotal
Balance at December 31, 2022 (1)$2,651,193 $183,951 $95,067 $2,930,211 
Additions due to an acquisition (2)4,176 — — 4,176 
Foreign currency translation impact2,180 46 647 2,873 
Balance at December 31, 2023 (1)2,657,549 183,997 95,714 2,937,260 
Foreign currency translation impact(6,568)(77)(410)(7,055)
Balance at December 31, 2024 (1)$2,650,981 $183,920 $95,304 $2,930,205 
(1)The Company does not have any accumulated goodwill impairment losses.
(2)The additions were due to the acquisition of an independent sales agent in September 2023. See Note 2 — Acquisitions and Divestiture for additional information.

Finite-lived intangible assets. Changes in finite-lived intangible assets during the two-year period ended December 31, 2024 are presented in the tables below (in thousands).
December 31, 2024Customer
Relationships		Technology-relatedOther Total
Gross cost at December 31, 20231,077,183 11,200 10,200 $1,098,583 
Intangible assets fully amortized— (11,200)— (11,200)
Foreign currency translation impact(5,266)— — (5,266)
Gross cost1,071,917 — 10,200 1,082,117 
Accumulated amortization (2)(665,131)— (7,297)(672,428)
Balance at December 31, 2024$406,786 $— $2,903 $409,689 
December 31, 2023Customer
Relationships		Technology-relatedOther Total
Gross cost at December 31, 2022$1,060,541 $11,200 $10,436 $1,082,177 
Additions due to an acquisition (1)990 — — 990 
Intangible assets fully amortized(987)(39)(236)(1,262)
Foreign currency translation impact 16,639 39 — 16,678 
Gross cost1,077,183 11,200 10,200 1,098,583 
Accumulated amortization (2)(580,937)(9,333)(6,355)(596,625)
Balance at December 31, 2023$496,246 $1,867 $3,845 $501,958 
(1)The additions were due to the acquisition of an independent sales agent in September 2023. See Note 2 — Acquisitions and Divestiture for additional information.
(2)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 —4 to 11 years.

Amortization expense related to finite-lived intangible assets was $90.2 million, $92.5 million and $98.5 million in 2024, 2023 and 2022, respectively. The estimated future amortization expense by year for finite-lived intangible assets is presented in the table below (in thousands).
2025$81,066 
202678,391 
202777,783 
202876,311 
202976,233 
203019,905 
 $409,689