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Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract] |
Changes in Carrying Value of Goodwill by Operating Segment | The changes in the carrying value of goodwill by operating segment for the nine months ended September 30, 2013 are as follows:
(in thousands) |  | Retail |  |  | National Programs |  |  | Wholesale Brokerage |  |  | Services |  |  | Total |
Balance as of January 1, 2013 |  | $ | 876,219 |  |  | $ | 439,180 |  |  | $ | 288,054 |  |  | $ | 108,061 |  |  | $ | 1,711,514 |
Goodwill of acquired businesses |  |  | 252,753 |  |  |  | 27,485 |  |  |  | (812 | ) |  |  | — |  |  |  | 279,426 |
Balance as of September 30, 2013 |  | $ | 1,128,972 |  |  | $ | 466,665 |  |  | $ | 287,242 |  |  | $ | 108,061 |  |  | $ | 1,990,940 |

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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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