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Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2016
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, 2016 are as follows:
(in thousands) | Retail |  | National Programs |  | Wholesale Brokerage |  | Services |  | Total
Balance as of January 1, 2016 | $ | 1,345,636 |  |  | $ | 901,866 |  |  | $ | 226,961 |  |  | $ | 112,220 |  |  | $ | 2,586,683 |
Goodwill of acquired businesses | 11,854 |  |  | (1 | ) |  | 51,477 |  |  | 22,352 |  |  | 85,682 |
Goodwill of transferred businesses | 571 |  |  | (571 | ) |  | — |  |  | — |  |  | — |
Balance as of September 30, 2016 | $ | 1,358,061 |  |  | $ | 901,294 |  |  | $ | 278,438 |  |  | $ | 134,572 |  |  | $ | 2,672,365 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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