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Goodwill - Changes in Carrying Value of Goodwill by Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Goodwill [Line Items] |
Beginning balance | $ 2,006,173
Goodwill of acquired businesses | 503,107
Ending balance | 2,509,280
Retail [Member] |
Goodwill [Line Items] |
Beginning balance | 1,131,257
Goodwill of acquired businesses | 78,395
Ending balance | 1,209,652
National Programs [Member] |
Goodwill [Line Items] |
Beginning balance | 467,144
Goodwill of acquired businesses | 417,539
Ending balance | 884,683
Wholesale Brokerage [Member] |
Goodwill [Line Items] |
Beginning balance | 287,242
Goodwill of acquired businesses | 7,412
Ending balance | 294,654
Services [Member] |
Goodwill [Line Items] |
Beginning balance | 120,530
Goodwill of acquired businesses | (239)
Ending balance | $ 120,291

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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 -URI http://asc.fasb.org/extlink&oid=14024403&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 + Details
Name: | us-gaap_Goodwill
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 (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration