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Revenue and Related Matters (Tables)
 12 Months Ended
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue by Reportable Segment
Disaggregated revenue by reportable segment is presented in the tables below for the years indicated (in thousands).

By Primary Geographic Market (1)

Year Ended December 31, 2023
Primary Geographic MarketResearchConferencesConsultingTotal
United States and Canada$3,275,866 $317,531 $317,645 $3,911,042 
Europe, Middle East and Africa1,060,959 140,640 130,471 1,332,070 
Other International550,221 46,993 66,630 663,844 
Total revenues $4,887,046 $505,164 $514,746 $5,906,956 

Year Ended December 31, 2022
Primary Geographic MarketResearchConferencesConsultingTotal
United States and Canada$3,056,096 $263,165 $300,121 $3,619,382 
Europe, Middle East and Africa1,017,860 88,979 127,820 1,234,659 
Other International530,835 37,129 53,841 621,805 
Total revenues $4,604,791 $389,273 $481,782 $5,475,846 

Year Ended December 31, 2021
Primary Geographic MarketResearchConferencesConsultingTotal
United States and Canada$2,655,534 $146,707 $246,661 $3,048,902 
Europe, Middle East and Africa958,339 47,883 124,757 1,130,979 
Other International487,519 19,859 46,703 554,081 
Total revenues$4,101,392 $214,449 $418,121 $4,733,962 
(1)Revenue is reported based on where the sale is fulfilled.
Schedule of Disaggregation of Revenue
Year Ended December 31, 2023
Timing of Revenue RecognitionResearchConferencesConsultingTotal
Transferred over time (1)$4,506,621 $— $400,171 $4,906,792 
Transferred at a point in time (2)380,425 505,164 114,575 1,000,164 
Total revenues $4,887,046 $505,164 $514,746 $5,906,956 

Year Ended December 31, 2022
Timing of Revenue RecognitionResearchConferencesConsultingTotal
Transferred over time (1)$4,182,747 $— $378,062 $4,560,809 
Transferred at a point in time (2)422,044 389,273 103,720 915,037 
Total revenues $4,604,791 $389,273 $481,782 $5,475,846 

Year Ended December 31, 2021
Timing of Revenue RecognitionResearchConferencesConsultingTotal
Transferred over time (1)$3,740,694 $— $334,945 $4,075,639 
Transferred at a point in time (2)360,698 214,449 83,176 658,323 
Total revenues$4,101,392 $214,449 $418,121 $4,733,962 
(1)Research revenues were recognized in connection with performance obligations that were satisfied over time using a time-elapsed output method to measure progress. Consulting revenues were recognized over time using labor hours as an input measurement basis.
(2)The revenues in this category were recognized in connection with performance obligations that were satisfied at the point in time that the contractual deliverables were 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).
December 31,
20232022
Assets:
Fees receivable, gross (1)$1,610,228 $1,565,786 
Contract assets recorded in Prepaid expenses and other current assets (2)$28,791 $21,183 
Contract liabilities:
Deferred revenues (current liability) (3)$2,640,515 $2,443,762 
Non-current deferred revenues recorded in Other liabilities (3)33,490 39,115 
Total contract liabilities$2,674,005 $2,482,877 
(1)Fees receivable represent an unconditional right of 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 restriction.
(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).