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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 USD ($)
Goodwill [Line Items] |
Beginning balance | $ 4,395,918
Goodwill of acquired businesses | 176,658
Goodwill disposed of relating to sales of businesses | (3,050)
Foreign currency translation adjustments during the year | (4,370)
Ending balance | 4,565,156
Retail |
Goodwill [Line Items] |
Beginning balance | 2,650,470
Goodwill of acquired businesses | 174,536
Goodwill disposed of relating to sales of businesses | (3,050)
Foreign currency translation adjustments during the year | (4,434)
Ending balance | 2,817,522
National Programs |
Goodwill [Line Items] |
Beginning balance | 1,091,122
Goodwill of acquired businesses | (1,337)
Goodwill disposed of relating to sales of businesses | 0
Foreign currency translation adjustments during the year | 64
Ending balance | 1,089,849
Wholesale Brokerage |
Goodwill [Line Items] |
Beginning balance | 483,057
Goodwill of acquired businesses | 3,459
Goodwill disposed of relating to sales of businesses | 0
Foreign currency translation adjustments during the year |
Ending balance | 486,516
Services |
Goodwill [Line Items] |
Beginning balance | 171,269
Goodwill of acquired businesses |
Goodwill disposed of relating to sales of businesses | 0
Foreign currency translation adjustments during the year |
Ending balance | $ 171,269

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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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