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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |
Beginning balance | $ 3,746,094 | $ 3,432,786 |
Goodwill of acquired businesses | 648,095 | 328,546 | $ 717,700
Goodwill disposed of relating to sales of businesses | (782) | (15,238) |
Foreign currency translation adjustments during the year | 2,511 |  |
Ending balance | 4,395,918 | 3,746,094 | 3,432,786
Retail |  |  |
Goodwill [Line Items] |  |  |
Beginning balance | 2,351,291 | 2,063,150 |
Goodwill of acquired businesses | 299,961 | 302,640 | 676,900
Goodwill disposed of relating to sales of businesses | (782) | (14,499) |
Foreign currency translation adjustments during the year | 0 |  |
Ending balance | 2,650,470 | 2,351,291 | 2,063,150
National Programs |  |  |
Goodwill [Line Items] |  |  |
Beginning balance | 925,541 | 926,206 |
Goodwill of acquired businesses | 163,070 | 74 | 18,700
Goodwill disposed of relating to sales of businesses | 0 | (739) |
Foreign currency translation adjustments during the year | 2,511 |  |
Ending balance | 1,091,122 | 925,541 | 926,206
Wholesale Brokerage |  |  |
Goodwill [Line Items] |  |  |
Beginning balance | 298,101 | 291,622 |
Goodwill of acquired businesses | 184,956 | 6,479 | 5,500
Goodwill disposed of relating to sales of businesses | 0 | 0 |
Foreign currency translation adjustments during the year | 0 |  |
Ending balance | 483,057 | 298,101 | 291,622
Services |  |  |
Goodwill [Line Items] |  |  |
Beginning balance | 171,161 | 151,808 |
Goodwill of acquired businesses | 108 | 19,353 |
Goodwill disposed of relating to sales of businesses | 0 | 0 |
Foreign currency translation adjustments during the year | 0 |  |
Ending balance | $ 171,269 | $ 171,161 | $ 151,808

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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