v3.26.3
Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2026
Intangible Asset, Goodwill and Other [Abstract]  
Schedule of Changes to the Carrying Amount of Goodwill by Segment
The table below presents changes to the carrying amount of goodwill by segment during the nine months ended September 30, 2026 (in thousands).
InsightsConferencesConsultingTotal
Balance at December 31, 2025 $2,460,315 $184,052 $96,435 $2,740,802 
Foreign currency translation impact (1,627)(34)(249)(1,910)
Balance at September 30, 2026 $2,458,688 $184,018 $96,186 $2,738,892 
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, 2026Customer
Relationships		OtherTotal
Gross cost at December 31, 2025$1,021,757 $10,200 $1,031,957 
Foreign currency translation impact (4,519)— (4,519)
Gross cost1,017,238 10,200 1,027,438 
Accumulated amortization(1)
(743,555)(8,945)(752,500)
Balance at September 30, 2026$273,683 $1,255 $274,938 
December 31, 2025Customer
Relationships		Other Total
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 
(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).
2026 (remaining three months)$19,961 
202779,237 
202877,766 
202977,688 
203020,286 
$274,938