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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Beginning balance	$ 3,432,786	$ 2,716,079
Goodwill of acquired businesses	328,546	717,710	$ 42,200
Goodwill disposed of relating to sales of businesses	(15,238)	(1,003)
Ending balance	3,746,094	3,432,786	2,716,079
Retail
Goodwill [Line Items]
Beginning balance	2,063,150	1,386,248
Goodwill of acquired businesses	302,640	676,902	33,100
Goodwill disposed of relating to sales of businesses	(14,499)	0
Ending balance	2,351,291	2,063,150	1,386,248
National Programs
Goodwill [Line Items]
Beginning balance	926,206	908,472
Goodwill of acquired businesses	74	18,737	7,200
Goodwill disposed of relating to sales of businesses	(739)	(1,003)
Ending balance	925,541	926,206	908,472
Wholesale Brokerage
Goodwill [Line Items]
Beginning balance	291,622	286,098
Goodwill of acquired businesses	6,479	5,524	1,200
Goodwill disposed of relating to sales of businesses	0	0
Ending balance	298,101	291,622	286,098
Services
Goodwill [Line Items]
Beginning balance	151,808	135,261
Goodwill of acquired businesses	19,353	16,547
Goodwill disposed of relating to sales of businesses	0	0
Ending balance	$ 171,161	$ 151,808	$ 135,261

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 350
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-Paragraph 1
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- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Topic 350
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