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Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2019
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 nine months ended September 30, 2019 are as follows:
(in thousands) |  | Retail |  |  | National Programs |  |  | Wholesale Brokerage |  |  | Services |  |  | Total |
Balance as of December 31, 2018 |  | $ | 2,063,150 |  |  | $ | 926,206 |  |  | $ | 291,622 |  |  | $ | 151,808 |  |  | $ | 3,432,786 |
Goodwill of acquired businesses |  |  | 249,691 |  |  |  | 74 |  |  |  | 6,189 |  |  |  | 19,353 |  |  |  | 275,307 |
Goodwill disposed of relating to sales of businesses |  |  | (5,089 | ) |  |  | (739 | ) |  |  | — |  |  |  | — |  |  |  | (5,828 | )
Balance as of September 30, 2019 |  | $ | 2,307,752 |  |  | $ | 925,541 |  |  | $ | 297,811 |  |  | $ | 171,161 |  |  | $ | 3,702,265 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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