Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2020

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 nine months ended September 30, 2020 (in thousands).

	Research		Conferences		Consulting		Total
Balance at December 31, 2019 (1)	$	2,651,060	$	189,641	$	97,025	$	2,937,726
Foreign currency translation impact	1,187		29		(234)		982
Balance at September 30, 2020	$	2,652,247	$	189,670	$	96,791	$	2,938,708

(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).

September 30, 2020	Customer Relationships		Software		Content		Other		Total
Gross cost at December 31, 2019	$	1,145,109	$	111,033	$	14,140	$	30,838	$	1,301,120
Intangible assets fully amortized	(1,650)		(787)		(9,929)		(772)		(13,138)
Foreign currency translation impact	(11,339)		(375)		(246)		(72)		(12,032)
Gross cost	1,132,120		109,871		3,965		29,994		1,275,950
Accumulated amortization (1)	(351,738)		(77,239)		(3,177)		(22,802)		(454,956)
Balance at September 30, 2020	$	780,382	$	32,632	$	788	$	7,192	$	820,994

December 31, 2019	Customer Relationships		Software		Content		Other		Total
Gross cost	$	1,145,109	$	111,033	$	14,140	$	30,838	$	1,301,120
Accumulated amortization (1)	(283,369)		(61,564)		(11,225)		(19,875)		(376,033)
Balance at December 31, 2019	$	861,740	$	49,469	$	2,915	$	10,963	$	925,087

(1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—3 to 13 years; Software—2 to 7 years; Content—2 to 3 years; and Other—2 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).

2020 (remaining three months)	$	30,226
2021	104,109
2022	94,288
2023	94,272
2024	88,975
Thereafter	409,124
	$	820,994