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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2023
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 six months ended June 30, 2023 (in thousands).
 ResearchConferencesConsultingTotal
Balance at December 31, 2022 (1)$2,651,193 $183,951 $95,067 $2,930,211 
Foreign currency translation impact 1,033 22 555 1,610 
Balance at June 30, 2023 (1)$2,652,226 $183,973 $95,622 $2,931,821 
(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).
June 30, 2023Customer
Relationships		Technology-relatedOtherTotal
Gross cost at December 31, 2022$1,060,541 $11,200 $10,436 $1,082,177 
Intangible assets fully amortized— (632)— (632)
Foreign currency translation impact 16,292 38 — 16,330 
Gross cost1,076,833 10,606 10,436 1,097,875 
Accumulated amortization (1)(537,103)(6,873)(6,105)(550,081)
Balance at June 30, 2023$539,730 $3,733 $4,331 $547,794 
December 31, 2022Customer
Relationships		Technology-relatedOther Total
Gross cost $1,060,541 11,200 $10,436 $1,082,177 
Accumulated amortization (1)(486,260)(5,600)(5,603)(497,463)
Balance at December 31, 2022$574,281 $5,600 $4,833 $584,714 
(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—4 to 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).
2023 (remaining six months)$46,004 
202490,111 
202581,444 
202678,769 
202778,161 
Thereafter173,305 
$547,794