Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2022

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 six months ended June 30, 2022 (in thousands).

	Research		Conferences		Consulting		Total
Balance at December 31, 2021 (1)	$	2,670,934	$	184,021	$	96,362	$	2,951,317
Foreign currency translation impact	(6,795)		(79)		(1,186)		(8,060)
Balance at June 30, 2022 (1)	$	2,664,139	$	183,942	$	95,176	$	2,943,257

(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).

June 30, 2022	Customer Relationships		Technology-related		Other		Total
Gross cost at December 31, 2021	$	1,096,358	$	61,216	$	10,436	$	1,168,010
Foreign currency translation impact	(31,141)		(458)		—		(31,599)
Gross cost	1,065,217		60,758		10,436		1,136,411
Accumulated amortization (1)	(445,119)		(40,823)		(5,101)		(491,043)
Balance at June 30, 2022	$	620,098	$	19,935	$	5,335	$	645,368

December 31, 2021	Customer Relationships		Technology-related		Other		Total
Gross cost	$	1,096,358	$	61,216	$	10,436	$	1,168,010
Accumulated amortization (1)	(413,266)		(35,727)		(4,599)		(453,592)
Balance at December 31, 2021	$	683,092	$	25,489	$	5,837	$	714,418

(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 to 7 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).

2022 (remaining six months)	$	49,113
2023	98,211
2024	91,066
2025	80,550
2026	77,876
Thereafter	248,552
	$	645,368