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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Goodwill [Line Items] |
Goodwill, Written off Related to Sale of Business Unit | $ 1,004
Goodwill [Roll Forward] |
Beginning balance | 2,716,079
Goodwill of acquired businesses | 214,559
Ending balance | $ 2,929,634
Document Period End Date | Sep. 30, 2018
Services |
Goodwill [Line Items] |
Goodwill, Written off Related to Sale of Business Unit | $ 0
Goodwill [Roll Forward] |
Beginning balance | 1,386,248
Goodwill of acquired businesses | 173,025
Ending balance | 1,559,273
National Programs |
Goodwill [Line Items] |
Goodwill, Written off Related to Sale of Business Unit | 1,004
Goodwill [Roll Forward] |
Beginning balance | 908,472
Goodwill of acquired businesses | 18,737
Ending balance | 926,205
Wholesale Brokerage |
Goodwill [Line Items] |
Goodwill, Written off Related to Sale of Business Unit | 0
Goodwill [Roll Forward] |
Beginning balance | 286,098
Goodwill of acquired businesses | 5,524
Ending balance | 291,622
Services |
Goodwill [Line Items] |
Goodwill, Written off Related to Sale of Business Unit | 0
Goodwill [Roll Forward] |
Beginning balance | 135,261
Goodwill of acquired businesses | 17,273
Ending balance | $ 152,534

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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://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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- 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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