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Goodwill (Tables) | 6 Months Ended
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Jun. 30, 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 six months ended June 30, 2014 are as follows:
(in thousands) |  | Retail |  |  | National Programs |  |  | Wholesale Brokerage |  |  | Services |  |  | Total |
Balance as of January 1, 2014 |  | $ | 1,131,257 |  |  | $ | 467,144 |  |  | $ | 287,242 |  |  | $ | 120,530 |  |  | $ | 2,006,173 |
Goodwill of acquired businesses |  |  | 78,395 |  |  |  | 417,539 |  |  |  | 7,412 |  |  |  | (239 | ) |  |  | 503,107 |
Balance as of June 30, 2014 |  | $ | 1,209,652 |  |  | $ | 884,683 |  |  | $ | 294,654 |  |  | $ | 120,291 |  |  | $ | 2,509,280 |

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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=14024403&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=14024403&loc=d3e13854-109267 + Details
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