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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, 2016 USD ($)
Goodwill [Roll Forward] |
Beginning balance | $ 2,586,683
Goodwill of acquired businesses | 28,952
Goodwill, Transfers | 0
Goodwill disposed of relating to sales of businesses | 0
Ending balance | 2,615,635
Services |
Goodwill [Roll Forward] |
Beginning balance | 1,345,636
Goodwill of acquired businesses | 6,704
Goodwill, Transfers | 571
Goodwill disposed of relating to sales of businesses | 0
Ending balance | 1,352,911
National Programs |
Goodwill [Roll Forward] |
Beginning balance | 901,866
Goodwill of acquired businesses | (70)
Goodwill, Transfers | (571)
Goodwill disposed of relating to sales of businesses | 0
Ending balance | 901,225
Wholesale Brokerage |
Goodwill [Roll Forward] |
Beginning balance | 226,961
Goodwill of acquired businesses | 24
Goodwill, Transfers | 0
Goodwill disposed of relating to sales of businesses | 0
Ending balance | 226,985
Services |
Goodwill [Roll Forward] |
Beginning balance | 112,220
Goodwill of acquired businesses | 22,294
Goodwill, Transfers | 0
Goodwill disposed of relating to sales of businesses | 0
Ending balance | $ 134,514

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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_
Data Type: | xbrli:monetaryItemType
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 transfers into (out of) an asset representing the 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 (g) -URI http://asc.fasb.org/extlink&oid=35741047&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://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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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Period Type: |