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Goodwill (Tables) | 3 Months Ended
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Mar. 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 three months ended March 31, 2020 are as follows:
(in thousands) |  | Retail |  |  | National Programs |  |  | Wholesale Brokerage |  |  | Services |  |  | Total |
Balance as of December 31, 2019 |  | $ | 2,351,291 |  |  | $ | 925,541 |  |  | $ | 298,101 |  |  | $ | 171,161 |  |  | $ | 3,746,094 |
Goodwill of acquired businesses |  |  | 657 |  |  |  | 55,607 |  |  |  | 79,110 |  |  |  | 108 |  |  |  | 135,482 |
Goodwill disposed of relating to sales of businesses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance as of March 31, 2020 |  | $ | 2,351,948 |  |  | $ | 981,148 |  |  | $ | 377,211 |  |  | $ | 171,269 |  |  | $ | 3,881,576 |

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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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