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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2024
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, 2024 (in thousands).
 ResearchConferencesConsultingTotal
Balance at December 31, 2023 (1)$2,657,549 $183,997 $95,714 $2,937,260 
Foreign currency translation impact 78 1 441 520 
Balance at September 30, 2024 (1)$2,657,627 $183,998 $96,155 $2,937,780 
(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).
September 30, 2024Customer
Relationships		Technology-relatedOtherTotal
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 14,764 — — 14,764 
Gross cost1,091,947 — 10,200 1,102,147 
Accumulated amortization (1)(654,938)— (7,062)(662,000)
Balance at September 30, 2024$437,009 $— $3,138 $440,147 
December 31, 2023Customer
Relationships		Technology-relatedOther Total
Gross cost $1,077,183 11,200 $10,200 $1,098,583 
Accumulated amortization (1)(580,937)(9,333)(6,355)(596,625)
Balance at December 31, 2023$496,246 $1,867 $3,845 $501,958 
(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 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).
2024 (remaining three months)$22,352 
202582,606 
202679,932 
202779,324 
202877,852 
Thereafter98,081 
$440,147