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Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Retail [Member]	Mar. 31, 2014 National Programs [Member]	Dec. 31, 2013 National Programs [Member]	Mar. 31, 2014 Wholesale Brokerage [Member]	Dec. 31, 2013 Wholesale Brokerage [Member]	Mar. 31, 2014 Services [Member]	Dec. 31, 2013 Services [Member]
Goodwill [Line Items]
Beginning balance	$ 2,006,173	$ 1,131,257	$ 467,144	$ 467,144	$ 287,242	$ 287,242	$ 120,530	$ 120,530
Goodwill of acquired businesses	318	318
Ending balance	$ 2,006,491	$ 1,131,575	$ 467,144	$ 467,144	$ 287,242	$ 287,242	$ 120,530	$ 120,530

X

- 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

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- 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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Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration