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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, 2017 USD ($)
Goodwill [Roll Forward] |
Goodwill, Written off Related to Sale of Business Unit | $ 1,494
Beginning balance | 2,675,402
Goodwill of acquired businesses | 27,580
Ending balance | 2,701,488
Services |
Goodwill [Roll Forward] |
Goodwill, Written off Related to Sale of Business Unit | 1,494
Beginning balance | 1,354,667
Goodwill of acquired businesses | 18,807
Ending balance | 1,371,980
National Programs |
Goodwill [Roll Forward] |
Goodwill, Written off Related to Sale of Business Unit | 0
Beginning balance | 901,294
Goodwill of acquired businesses | 7,314
Ending balance | 908,608
Wholesale Brokerage |
Goodwill [Roll Forward] |
Goodwill, Written off Related to Sale of Business Unit | 0
Beginning balance | 284,869
Goodwill of acquired businesses | 770
Ending balance | 285,639
Services |
Goodwill [Roll Forward] |
Goodwill, Written off Related to Sale of Business Unit | 0
Beginning balance | 134,572
Goodwill of acquired businesses | 689
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=64834752&loc=SL49117168-202975 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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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- 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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- Details
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- Details
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- Details
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