Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to the carrying amount of goodwill by reporting unit

The table below presents changes to the carrying amount of goodwill by segment during the three months ended March 31, 2023 (in thousands).

	Research		Conferences		Consulting		Total
Balance at December 31, 2022 (1)	$	2,651,193	$	183,951	$	95,067	$	2,930,211
Foreign currency translation impact	(390)		1		119		(270)
Balance at March 31, 2023 (1)	$	2,650,803	$	183,952	$	95,186	$	2,929,941

(1)The Company does not have any accumulated goodwill impairment losses.

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, 2023	Customer Relationships		Technology-related		Other		Total
Gross cost at December 31, 2022	$	1,060,541	$	11,200	$	10,436	$	1,082,177
Foreign currency translation impact	3,931		—		—		3,931
Gross cost	1,064,472		11,200		10,436		1,086,108
Accumulated amortization (1)	(509,583)		(6,533)		(5,854)		(521,970)
Balance at March 31, 2023	$	554,889	$	4,667	$	4,582	$	564,138

December 31, 2022	Customer Relationships		Technology-related		Other		Total
Gross cost	$	1,060,541	11,200		$	10,436	$	1,082,177
Accumulated amortization (1)	(486,260)		(5,600)		(5,603)		(497,463)
Balance at December 31, 2022	$	574,281	$	5,600	$	4,833	$	584,714

(1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—6 to 13 years; Technology-related—3 years; and Other—4 to 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).

2023 (remaining nine months)	$	68,301
2024	89,160
2025	80,493
2026	77,818
2027	77,210
Thereafter	171,156
	$	564,138