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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |
Beginning balance | $ 2,716,079 | $ 2,675,402
Goodwill of acquired businesses | 717,710 | 42,172
Goodwill disposed of relating to sales of businesses | (1,003) | (1,495)
Ending balance | 3,432,786 | 2,716,079
Retail |  |
Goodwill [Roll Forward] |  |
Beginning balance | 1,386,248 | 1,354,667
Goodwill of acquired businesses | 676,902 | 33,076
Goodwill disposed of relating to sales of businesses | 0 | (1,495)
Ending balance | 2,063,150 | 1,386,248
National Programs |  |
Goodwill [Roll Forward] |  |
Beginning balance | 908,472 | 901,294
Goodwill of acquired businesses | 18,737 | 7,178
Goodwill disposed of relating to sales of businesses | (1,003) | 0
Ending balance | 926,206 | 908,472
Wholesale Brokerage |  |
Goodwill [Roll Forward] |  |
Beginning balance | 286,098 | 284,869
Goodwill of acquired businesses | 5,524 | 1,229
Goodwill disposed of relating to sales of businesses | 0 | 0
Ending balance | 291,622 | 286,098
Services |  |
Goodwill [Roll Forward] |  |
Beginning balance | 135,261 | 134,572
Goodwill of acquired businesses | 16,547 | 689
Goodwill disposed of relating to sales of businesses | 0 | 0
Ending balance | $ 151,808 | $ 135,261

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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 -Subparagraph (a) -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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Balance Type: | debit
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 (b) -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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