Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes to the Carrying Amount of Goodwill by Segment

The table below presents changes to the carrying amount of goodwill by segment during the three months ended March 31, 2026 (in thousands).

	Insights		Conferences		Consulting		Total
Balance at December 31, 2025	$	2,460,315	$	184,052	$	96,435	$	2,740,802
Foreign currency translation impact	(447)		(10)		(81)		(538)
Balance at March 31, 2026	$	2,459,868	$	184,042	$	96,354	$	2,740,264

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, 2026	Customer Relationships		Other		Total
Gross cost at December 31, 2025	$	1,021,757	$	10,200	$	1,031,957
Foreign currency translation impact	(1,623)		—		(1,623)
Gross cost	1,020,134		10,200		1,030,334
Accumulated amortization (1)	(706,106)		(8,474)		(714,580)
Balance at March 31, 2026	$	314,028	$	1,726	$	315,754

December 31, 2025	Customer Relationships		Other		Total
Gross cost	$	1,021,757	$	10,200	$	1,031,957
Accumulated amortization (1)	(687,416)		(8,238)		(695,654)
Balance at December 31, 2025	$	334,341	$	1,962	$	336,303

(1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—6 to 13 years and Other—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).

2026 (remaining nine months)	$	60,052
2027	79,460
2028	77,989
2029	77,910
2030	20,343
	$	315,754