Goodwill (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Carrying Value of Goodwill by Operating Segment

The changes in the carrying value of goodwill by reportable segment for the years ended December 31, are as follows:

(in thousands)	Retail			National Programs			Wholesale Brokerage		Services		Total
Balance as of January 1, 2019	$	2,063,150		$	926,206		$	291,622	$	151,808	$	3,432,786
Goodwill of acquired businesses		302,640			74			6,479		19,353		328,546
Goodwill disposed of relating to sales of businesses		(14,499	)		(739	)		—		—		(15,238	)
Balance as of December 31, 2019	$	2,351,291		$	925,541		$	298,101	$	171,161	$	3,746,094
Goodwill of acquired businesses		299,961			163,070			184,956		108		648,095
Goodwill disposed of relating to sales of businesses		(782	)		—			—		—		(782	)
Foreign currency translation adjustments during the year		—			2,511			—		—		2,511
Balance as of December 31, 2020	$	2,650,470		$	1,091,122		$	483,057	$	171,269	$	4,395,918