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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
Goodwill [Line Items] |
Goodwill, Written off Related to Sale of Business Unit | $ 1,627
Goodwill [Roll Forward] |
Beginning balance | 3,432,786
Goodwill of acquired businesses | 120,502
Ending balance | $ 3,551,661
Document Period End Date | Jun. 30, 2019
Services |
Goodwill [Line Items] |
Goodwill, Written off Related to Sale of Business Unit | $ 1,627
Goodwill [Roll Forward] |
Beginning balance | 2,063,150
Goodwill of acquired businesses | 95,086
Ending balance | 2,156,609
National Programs |
Goodwill [Line Items] |
Goodwill, Written off Related to Sale of Business Unit | 0
Goodwill [Roll Forward] |
Beginning balance | 926,206
Goodwill of acquired businesses | 0
Ending balance | 926,206
Wholesale Brokerage |
Goodwill [Line Items] |
Goodwill, Written off Related to Sale of Business Unit | 0
Goodwill [Roll Forward] |
Beginning balance | 291,622
Goodwill of acquired businesses | 6,063
Ending balance | 297,685
Services |
Goodwill [Line Items] |
Goodwill, Written off Related to Sale of Business Unit | 0
Goodwill [Roll Forward] |
Beginning balance | 151,808
Goodwill of acquired businesses | 19,353
Ending balance | $ 171,161

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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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://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=77989000&loc=SL49117168-202975 Reference 2: 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=108376223&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://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=108376223&loc=d3e13816-109267 + Details
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