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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Roll Forward] |  |
Beginning balance | $ 2,460,611 | $ 2,006,173
Goodwill of acquired businesses | 136,381 | 513,951
Goodwill disposed of relating to sales of businesses | (10,309) | (59,513)
Ending balance | 2,586,683 | 2,460,611
Retail |  |
Goodwill [Roll Forward] |  |
Beginning balance | 1,231,869 | 1,141,485
Goodwill of acquired businesses | 113,767 | 94,080
Goodwill disposed of relating to sales of businesses | 0 | (3,696)
Ending balance | 1,345,636 | 1,231,869
National Programs |  |
Goodwill [Roll Forward] |  |
Beginning balance | 886,095 | 475,596
Goodwill of acquired businesses | 18,009 | 420,063
Goodwill disposed of relating to sales of businesses | (2,238) | (9,564)
Ending balance | 901,866 | 886,095
Wholesale Brokerage |  |
Goodwill [Roll Forward] |  |
Beginning balance | 222,356 | 268,562
Goodwill of acquired businesses | 4,605 | 47
Goodwill disposed of relating to sales of businesses | 0 | (46,253)
Ending balance | 226,961 | 222,356
Services |  |
Goodwill [Roll Forward] |  |
Beginning balance | 120,291 | 120,530
Goodwill of acquired businesses | 0 | (239)
Goodwill disposed of relating to sales of businesses | (8,071) | 0
Ending balance | $ 112,220 | $ 120,291

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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=35741047&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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Period Type: | instant

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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=35741047&loc=d3e13816-109267 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of divestiture 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 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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- Details
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- Details
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