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Revenue and Related Matters (Tables)
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue by Reportable Segment
Our disaggregated revenue by reportable segment is presented in the tables below for the years indicated (in thousands).

By Primary Geographic Market (1), (2)

Year Ended December 31, 2020
Primary Geographic MarketResearchConferencesConsultingTotal
United States and Canada$2,339,482 $75,024 $223,318 $2,637,824 
Europe, Middle East and Africa826,752 28,108 111,413 966,273 
Other International436,658 17,008 41,640 495,306 
Total revenues $3,602,892 $120,140 $376,371 $4,099,403 

Year Ended December 31, 2019
Primary Geographic MarketResearchConferencesConsultingTotal
United States and Canada$2,199,008 $295,857 $239,625 $2,734,490 
Europe, Middle East and Africa751,267 122,591 122,146 996,004 
Other International424,273 58,421 32,133 514,827 
Total revenues $3,374,548 $476,869 $393,904 $4,245,321 

Year Ended December 31, 2018
Primary Geographic MarketResearchConferencesConsultingOtherTotal
United States and Canada$1,994,016 $256,219 $205,874 $58,843 $2,514,952 
Europe, Middle East and Africa737,129 105,909 119,258 38,194 1,000,490 
Other International374,619 48,333 28,535 8,525 460,012 
Total revenues$3,105,764 $410,461 $353,667 $105,562 $3,975,454 

(1)Revenue is reported based on where the sale is fulfilled.
(2)During 2018, the Company divested all of the non-core businesses that comprised its Other segment and moved a small residual product from the Other segment into the Research business and, as a result, no operating activity has been recorded in the Other segment in 2019 or 2020. Note 2 — Acquisitions and Divestitures provides additional information regarding the Company’s 2018 divestitures.
Schedule of Disaggregation of Revenue
Year Ended December 31, 2020
Timing of Revenue RecognitionResearchConferencesConsultingTotal
Transferred over time (2)$3,313,111 $— $296,546 $3,609,657 
Transferred at a point in time (3)289,781 120,140 79,825 489,746 
Total revenues $3,602,892 $120,140 $376,371 $4,099,403 
Year Ended December 31, 2019
Timing of Revenue RecognitionResearchConferencesConsultingTotal
Transferred over time (2)$3,083,936 $— $316,042 $3,399,978 
Transferred at a point in time (3)290,612 476,869 77,862 845,343 
Total revenues $3,374,548 $476,869 $393,904 $4,245,321 

Year Ended December 31, 2018
Timing of Revenue RecognitionResearchConferencesConsultingOtherTotal
Transferred over time (2)$2,851,176 $— $294,397 $86,667 $3,232,240 
Transferred at a point in time (3)254,588 410,461 59,270 18,895 743,214 
Total revenues$3,105,764 $410,461 $353,667 $105,562 $3,975,454 

(1)During 2018, the Company divested all of the non-core businesses that comprised its Other segment and moved a small residual product from the Other segment into the Research business and, as a result, no operating activity has been recorded in the Other segment in 2019 or 2020. Note 2 — Acquisitions and Divestitures provides additional information regarding the Company’s 2018 divestitures.
(2)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. During 2018, Other revenues were recognized using either a time-elapsed output method, performance-based milestone approach or labor hours, depending on the nature of the underlying customer contract.
(3)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,
20202019
Assets:
Fees receivable, gross (1)$1,251,508 $1,334,012 
Contract assets recorded in Prepaid expenses and other current assets (2)$14,440 $21,350 
Contract liabilities:
Deferred revenues (current liability) (3)$1,974,548 $1,928,020 
Non-current deferred revenues recorded in Other liabilities (3)26,754 24,409 
Total contract liabilities$2,001,302 $1,952,429 

(1)Fees receivable represent an unconditional right of payment from our customers and include both billed and unbilled amounts.
(2)Contract assets represent recognized revenue for which we do 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 our performance obligation(s).