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Goodwill (Schedule of Goodwill) (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011
Beginning Balance	$ 1,194,827
Goodwill of acquired businesses	70,692
Goodwill disposed of relating to sales of businesses	(3,892)
Ending Balance	1,261,627
Goodwill impairment	0
Retail [Member]
Beginning Balance	716,626
Goodwill of acquired businesses	68,405
Goodwill disposed of relating to sales of businesses	(3,892)
Ending Balance	781,139
National Programs [Member]
Beginning Balance	152,601
Goodwill of acquired businesses	2,287
Goodwill disposed of relating to sales of businesses
Ending Balance	154,888
Wholesale Brokerage [Member]
Beginning Balance	257,360
Goodwill of acquired businesses
Goodwill disposed of relating to sales of businesses
Ending Balance	257,360
Services [Member]
Beginning Balance	68,240
Goodwill of acquired businesses
Goodwill disposed of relating to sales of businesses
Ending Balance	$ 68,240

X

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

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X

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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- Definition

Write-off of the carrying amount of goodwill associated with all or a portion of a reporting unit that is sold in the period.

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