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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2014
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 years ended December 31, are as follows:
(in thousands) |  | Retail |  |  | National Programs |  |  | Wholesale Brokerage |  |  | Service |  |  | Total |
Balance as of January 1, 2013 |  | $ | 876,219 |  |  | $ | 439,180 |  |  | $ | 288,054 |  |  | $ | 108,061 |  |  | $ | 1,711,514 |
Goodwill of acquired businesses |  |  | 257,196 |  |  |  | 27,964 |  |  |  | (812 | ) |  |  | 12,469 |  |  |  | 296,817 |
Goodwill disposed of relating to sales of businesses |  |  | (2,158 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,158 | )
Balance as of December 31, 2013 |  |  | 1,131,257 |  |  |  | 467,144 |  |  |  | 287,242 |  |  |  | 120,530 |  |  |  | 2,006,173 |
Goodwill of acquired businesses |  |  | 86,454 |  |  |  | 420,063 |  |  |  | 7,673 |  |  |  | (239 | ) |  |  | 513,951 |
Goodwill disposed of relating to sales of businesses |  |  | (3,696 | ) |  |  | (9,564 | ) |  |  | (46,253 | ) |  |  | — |  |  |  | (59,513 | )
Balance as of December 31, 2014 |  | $ | 1,214,015 |  |  | $ | 877,643 |  |  | $ | 248,662 |  |  | $ | 120,291 |  |  | $ | 2,460,611 |

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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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