Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

As of December 31, goodwill was as follows:

	Integrated Agencies Network		Brand Performance Network		Communications Network		All Other		Total
Balance at December 31, 2019	$	88,094	$	177,073	$	33,258	$	26,760	$	325,185
Acquired goodwill	7,070		235		16,275		195		23,775
Foreign currency translation	—		3,331		—		(566)		2,765
Balance at December 31, 2020	$	95,164	$	180,639	$	49,533	$	26,389	$	351,725
Acquired goodwill	1,058,411		178,994		66,244		—		1,303,649
Disposition	—		—		—		(935)		(935)
Foreign currency translation	(502)		(1,020)		—		(194)		(1,716)
Balance at December 31, 2021	$	1,153,073	$	358,613	$	115,777	$	25,260	$	1,652,723
Acquired goodwill (1)	3,330		26,176		6,569		29,387		65,462
Impairment	(49,840)		(49,314)		—		(17,560)		(116,714)
Transfer of goodwill between segments (2)	(111,065)		111,065		—		—		—
Foreign currency translation	(11,422)		(13,467)		(753)		—		(25,642)
Other (3)	(15,682)		685		6,124		—		(8,873)
Balance at December 31, 2022	$	968,394	$	433,758	$	127,717	$	37,087	$	1,566,956

Schedule of Intangible Assets and Goodwill

The gross and net amounts of intangible assets other than goodwill as of December 31, are as follows:

Intangible Assets	2022		2021
Customer relationships – gross	$	875,160	$	875,541
Accumulated amortization	(150,655)		(92,746)
Customer relationships – net	$	724,505	$	782,795
Trade names – gross	$	197,037	$	190,162
Accumulated amortization	(53,150)		(36,775)
Trade names – net	$	143,887	$	153,387
Developed technology and other intangible assets – gross	$	63,565	$	37,550
Accumulated amortization	(24,428)		(14,950)
Developed technology and other intangible assets – net	$	39,137	$	22,600
Total intangible assets	$	1,135,762	$	1,103,253
Accumulated amortization	(228,233)		(144,471)
Total intangible assets – net	$	907,529	$	958,782

Finite-Lived Intangible Assets Amortization Expense

The estimated amortization expense for the five succeeding years is as follows:

Year	Amortization
2023	$	101,734
2024	96,245
2025	95,380
2026	84,089
2027	82,007
Thereafter	448,074