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Revenue and Related Matters (Tables)
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue by Reportable Segment
Disaggregated Revenue — The Company’s disaggregated revenue by reportable segment is presented in the tables below for the periods indicated (in thousands).

By Primary Geographic Market (1)
Three Months Ended September 30, 2025
Primary Geographic MarketInsightsConferencesConsultingOtherTotal
United States and Canada$770,945 $11,433 $78,299 $46,891 $907,568 
Europe, Middle East and Africa340,492 39,356 32,987 5,892 418,727 
Other International159,287 23,765 12,287 2,438 197,777 
Total revenues $1,270,724 $74,554 $123,573 $55,221 $1,524,072 
Three Months Ended September 30, 2024
Primary Geographic MarketInsightsConferencesConsultingOtherTotal
United States and Canada$777,405 $8,191 $79,448 $58,790 $923,834 
Europe, Middle East and Africa288,649 40,486 30,637 9,267 369,039 
Other International143,470 27,099 17,537 3,327 191,433 
Total revenues$1,209,524 $75,776 $127,622 $71,384 $1,484,306 
Nine Months Ended September 30, 2025
Primary Geographic MarketInsightsConferencesConsultingOtherTotal
United States and Canada$2,342,406 $205,302 $261,042 $149,069 $2,957,819 
Europe, Middle East and Africa977,139 103,793 108,086 20,762 1,209,780 
Other International470,253 49,463 49,745 7,596 577,057 
Total revenues$3,789,798 $358,558 $418,873 $177,427 $4,744,656 
Nine Months Ended September 30, 2024
Primary Geographic MarketInsightsConferencesConsultingOtherTotal
United States and Canada $2,313,152 $187,400 $248,930 $190,983 $2,940,465 
Europe, Middle East and Africa841,781 97,443 101,920 31,328 1,072,472 
Other International427,305 47,086 54,441 10,523 539,355 
Total revenues$3,582,238 $331,929 $405,291 $232,834 $4,552,292 
(1)Revenue is reported based on where the sale is fulfilled.
Schedule of Disaggregation of Revenue
By Timing of Revenue Recognition
Three Months Ended September 30, 2025
Timing of Revenue RecognitionInsightsConferencesConsultingOtherTotal
Transferred over time (1)$1,268,460 $— $94,043 $465 $1,362,968 
Transferred at a point in time (2)2,264 74,554 29,530 54,756 161,104 
Total revenues $1,270,724 $74,554 $123,573 $55,221 $1,524,072 
Three Months Ended September 30, 2024
Timing of Revenue RecognitionInsightsConferencesConsultingOtherTotal
Transferred over time (1)$1,205,568 $— $101,246 $614 $1,307,428 
Transferred at a point in time (2)3,956 75,776 26,376 70,770 176,878 
Total revenues$1,209,524 $75,776 $127,622 $71,384 $1,484,306 
Nine Months Ended September 30, 2025
Timing of Revenue RecognitionInsightsConferencesConsultingOtherTotal
Transferred over time (1)$3,781,197 $— $308,077 $1,227 $4,090,501 
Transferred at a point in time (2)8,601 358,558 110,796 176,200 654,155 
Total revenues $3,789,798 $358,558 $418,873 $177,427 $4,744,656 
Nine Months Ended September 30, 2024
Timing of Revenue RecognitionInsightsConferencesConsultingOtherTotal
Transferred over time (1)$3,573,963 $— $316,417 $2,113 $3,892,493 
Transferred at a point in time (2)8,275 331,929 88,874 230,721 659,799 
Total revenues$3,582,238 $331,929 $405,291 $232,834 $4,552,292 
(1)Insights revenues in this category are recognized in connection with performance obligations that are satisfied over time using a time-elapsed output method to measure progress. Consulting revenues in this category are recognized over time using costs incurred to date relative to total estimated costs at completion.
(2)The revenues in this category are recognized in connection with performance obligations that are satisfied at the point in time that the contractual deliverables are provided to the customer.
Schedule for Contract with Customer, Asset and Liability The table below provides information regarding certain of the Company’s balance sheet accounts that pertain to its contracts with customers (in thousands).
September 30,December 31,
20252024
Assets:
Fees receivable, gross (1)$1,125,487 $1,704,725 
Contract assets recorded in Prepaid expenses and other current assets (2)$57,565 $31,056 
Contract liabilities:
Deferred revenues (current liability) (3)$2,531,532 $2,762,927 
Non-current deferred revenues recorded in Other liabilities (3)22,645 27,389 
Total contract liabilities$2,554,177 $2,790,316 
(1)Fees receivable represent an unconditional right to payment from the Company’s customers and include both billed and unbilled amounts.
(2)Contract assets represent recognized revenue for which the Company does not have an unconditional right to payment as of the balance sheet date because the project may be subject to a progress billing milestone or some other billing restrictions.
(3)Deferred revenues represent amounts (i) for which the Company has received an upfront customer payment or (ii) that pertain to recognized fees receivable. Both situations occur before the completion of the Company’s performance obligation(s).