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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($)
Goodwill [Roll Forward] |
Beginning balance | $ 2,716,079
Goodwill of acquired businesses | 31,367
Ending balance | 2,747,446
Services |
Goodwill [Roll Forward] |
Beginning balance | 1,386,248
Goodwill of acquired businesses | 31,356
Ending balance | 1,417,604
National Programs |
Goodwill [Roll Forward] |
Beginning balance | 908,472
Goodwill of acquired businesses | 0
Ending balance | 908,472
Wholesale Brokerage |
Goodwill [Roll Forward] |
Beginning balance | 286,098
Goodwill of acquired businesses | 11
Ending balance | 286,109
Services |
Goodwill [Roll Forward] |
Beginning balance | 135,261
Goodwill of acquired businesses | 0
Ending balance | $ 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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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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- Details
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- Details
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- Details
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- Details
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