Goodwill (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Value of Goodwill by Operating Segment

three months ended March 31, 2018 are as follows:

(in thousands)	Retail		National Programs		Wholesale Brokerage		Services		Total
Balance as of January 1, 2018	$	1,386,248	$	908,472	$	286,098	$	135,261	$	2,716,079
Goodwill of acquired businesses	31,356		—		11		—		31,367
Balance as of March 31, 2018	$	1,417,604	$	908,472	$	286,109	$	135,261	$	2,747,446