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Goodwill (Schedule Of Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Goodwill [Line Items]    
Beginning balance $ 1,194,827 $ 1,074,397
Goodwill of acquired businesses 132,534 120,430
Goodwill disposed of relating to sales of businesses (3,892)  
Ending balance 1,323,469 1,194,827
Retail [Member]
    
Goodwill [Line Items]    
Beginning balance 716,626 656,108
Goodwill of acquired businesses 112,610 60,518
Goodwill transferred (1,771)  
Goodwill disposed of relating to sales of businesses (3,892)  
Ending balance 823,573 716,626
National Programs [Member]
    
Goodwill [Line Items]    
Beginning balance 152,601 152,601
Goodwill of acquired businesses 11,853   
Ending balance 164,454 152,601
Wholesale Brokerage [Member]
    
Goodwill [Line Items]    
Beginning balance 257,360 256,418
Goodwill of acquired businesses   942
Goodwill transferred 1,771  
Ending balance 259,131 257,360
Services [Member]
    
Goodwill [Line Items]    
Beginning balance 68,240 9,270
Goodwill of acquired businesses 8,071 58,970
Ending balance $ 76,311 $ 68,240