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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 Retail [Member] | Sep. 30, 2013 National Programs [Member] | Sep. 30, 2013 Wholesale Brokerage [Member] | Sep. 30, 2013 Services [Member] | Dec. 31, 2012 Services [Member]
Goodwill [Line Items] |  |  |  |  |  |
Beginning balance | $ 1,711,514 | $ 876,219 | $ 439,180 | $ 288,054 | $ 108,061 | $ 108,061
Goodwill of acquired businesses | 279,426 | 252,753 | 27,485 | (812) |  |
Ending balance | $ 1,990,940 | $ 1,128,972 | $ 466,665 | $ 287,242 | $ 108,061 | $ 108,061

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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