Segment Information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Schedule of Segment Reporting Information by Segment

The tables below present information about the Company’s reportable segments for the years ended December 31 (in thousands).

	Research		Conferences		Consulting		Consolidated
2023
Revenues	$	4,887,046	$	505,164	$	514,746	$	5,906,956
Gross contribution	3,600,143		253,739		181,501		4,035,383
Corporate and other expenses							(2,798,489)
Operating income							$	1,236,894
2022
Revenues	$	4,604,791	$	389,273	$	481,782	$	5,475,846
Gross contribution	3,414,574		210,726		189,834		3,815,134
Corporate and other expenses							(2,715,028)
Operating income							$	1,100,106
2021
Revenues	$	4,101,392	$	214,449	$	418,121	$	4,733,962
Gross contribution	3,036,925		133,748		158,843		3,329,516
Corporate and other expenses							(2,413,765)
Operating income							$	915,751

Schedule of Reconciliation of Segment Gross Contribution to Net Income

The table below provides a reconciliation of total segment gross contribution to net income for the years ended December 31 (in thousands).

	2023		2022		2021
Total segment gross contribution	$	4,035,383	$	3,815,134	$	3,329,516
Costs and expenses:
Cost of services and product development - unallocated (1)	31,667		33,059		39,647
Selling, general and administrative	2,701,542		2,480,944		2,155,658
Depreciation and amortization	191,103		191,946		212,405
Acquisition and integration charges	9,587		9,079		6,055
Gain from sale of divested operation	(135,410)		—		—
Operating income	1,236,894		1,100,106		915,751
Interest expense and other, net	(92,842)		(72,911)		(98,191)
Gain on event cancellation insurance claims	3,077		—		152,310
Less: Provision for income taxes	264,663		219,396		176,310
Net income	$	882,466	$	807,799	$	793,560

(1)The unallocated amounts consist of certain bonus and fringe costs recorded in consolidated Cost of services and product development that are not allocated to segment expense. The Company’s policy is to allocate bonuses to segments at 100% of a segment employee’s target bonus. Amounts above or below 100% are absorbed by corporate.

Schedule of Revenue from External Customers and Long-Lived Assets by Geographical Areas

Disaggregated revenue information by reportable segment for the three years ended December 31, 2023 is presented in Note 9 — Revenue and Related Matters. Long-lived asset information by geographic location as of December 31 is summarized in the table below (in thousands).

	2023		2022
Long-lived assets (1):
United States and Canada	$	625,269	$	622,993
Europe, Middle East and Africa	233,272		252,573
Other International	110,274		123,138
Total long-lived assets	$	968,815	$	998,704

(1)Excludes goodwill and intangible assets for all dates.