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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2021
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 three months ended March 31, 2021 (in thousands).
 ResearchConferencesConsultingTotal
Balance at December 31, 2020 (1)$2,664,732 $184,091 $96,724 $2,945,547 
Foreign currency translation impact (1,917)(38)(92)(2,047)
Balance at March 31, 2021$2,662,815 $184,053 $96,632 $2,943,500 

(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).
March 31, 2021Customer
Relationships		SoftwareContentOtherTotal
Gross cost at December 31, 2020$1,154,210 $110,597 $3,965 $10,614 $1,279,386 
Foreign currency translation impact 948 53 — — 1,001 
Gross cost1,155,158 110,650 3,965 10,614 1,280,387 
Accumulated amortization (1)(406,074)(88,933)(3,965)(3,974)(502,946)
Balance at March 31, 2021$749,084 $21,717 $— $6,640 $777,441 

December 31, 2020Customer
Relationships		SoftwareContentOther Total
Gross cost $1,154,210 $110,597 $3,965 $10,614 $1,279,386 
Accumulated amortization (1)(381,776)(83,320)(3,595)(3,697)(472,388)
Balance at December 31, 2020$772,434 $27,277 $370 $6,917 $806,998 

(1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—6 to 13 years; Software—3 to 7 years; Content—2 to 3 years; and Other—2 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).
2021 (remaining nine months)$75,546 
202296,169 
202396,154 
202490,819 
202582,150 
Thereafter336,603 
$777,441