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Changes in Carrying Value of Goodwill by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Beginning balance $ 1,711,514 $ 1,323,469
Goodwill of acquired businesses 296,817 393,547
Goodwill disposed of relating to sales of businesses (2,158) (5,502)
Ending balance 2,006,173 1,711,514
Retail [Member]
    
Goodwill [Line Items]    
Beginning balance 876,219 823,573
Goodwill of acquired businesses 257,196 58,148
Goodwill disposed of relating to sales of businesses (2,158) (5,502)
Ending balance 1,131,257 876,219
National Programs [Member]
    
Goodwill [Line Items]    
Beginning balance 439,180 149,802
Goodwill of acquired businesses 27,964 289,378
Goodwill disposed of relating to sales of businesses     
Ending balance 467,144 439,180
Wholesale Brokerage [Member]
    
Goodwill [Line Items]    
Beginning balance 288,054 273,783
Goodwill of acquired businesses (812) 14,271
Goodwill disposed of relating to sales of businesses     
Ending balance 287,242 288,054
Services [Member]
    
Goodwill [Line Items]    
Beginning balance 108,061 76,311
Goodwill of acquired businesses 12,469 31,750
Goodwill disposed of relating to sales of businesses     
Ending balance $ 120,530 $ 108,061