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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2023 (in thousands).
 ResearchConferencesConsultingTotal
Balance at December 31, 2022 (1)$2,651,193 $183,951 $95,067 $2,930,211 
Addition due to an acquisition (2)4,176 — — 4,176 
Foreign currency translation impact (1,267)— 146 (1,121)
Balance at September 30, 2023 (1)$2,654,102 $183,951 $95,213 $2,933,266 
(1)The Company does not have any accumulated goodwill impairment losses.
(2)The addition was due to the acquisition of an independent sales agent in September 2023. See Note 2 - Acquisitions and Divestiture for additional information.
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, 2023Customer
Relationships		Technology-relatedOtherTotal
Gross cost at December 31, 2022$1,060,541 $11,200 $10,436 $1,082,177 
Addition due to an acquisition (2)990 — — 990 
Intangible assets fully amortized(987)(39)— (1,026)
Foreign currency translation impact 4,970 39 — 5,009 
Gross cost1,065,514 11,200 10,436 1,087,150 
Accumulated amortization (1)(553,279)(8,400)(6,356)(568,035)
Balance at September 30, 2023$512,235 $2,800 $4,080 $519,115 
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.
(2)The addition was due to the acquisition of an independent sales agent in September 2023. See Note 2 - Acquisitions and Divestiture for additional information.
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 three months)$22,777 
202489,240 
202580,573 
202677,899 
202777,290 
Thereafter171,336 
$519,115