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Business Combinations (Acquisitions Accounted For As Business Combinations) (Detail) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2011
Balcos Insurance, Inc., Et Al [Member]
Sep. 30, 2011
Associated Insurance Service, Inc., Et Al [Member]
Sep. 30, 2011
United Benefit Services Insurance Agency, Et Al [Member]
Sep. 30, 2011
First Horizon Insurance Group, Inc. et al. [Member]
Sep. 30, 2011
Fitzharris Agency, Inc. et al. [Member]
Sep. 30, 2011
Corporate Benefit Consultants, LLC [Member]
Sep. 30, 2012
Other [Member]
Sep. 30, 2011
Other [Member]
Sep. 30, 2012
Arrowhead General Insurance Agency Superholding Corporation [Member]
Sep. 30, 2012
Texas Security General Insurance Agency Inc [Member]
Sep. 30, 2011
Retail [Member]
Sep. 30, 2011
Retail [Member]
Balcos Insurance, Inc., Et Al [Member]
Sep. 30, 2011
Retail [Member]
Associated Insurance Service, Inc., Et Al [Member]
Sep. 30, 2011
Retail [Member]
United Benefit Services Insurance Agency, Et Al [Member]
Sep. 30, 2011
Retail [Member]
First Horizon Insurance Group, Inc. et al. [Member]
Sep. 30, 2011
Retail [Member]
Fitzharris Agency, Inc. et al. [Member]
Sep. 30, 2011
Retail [Member]
Corporate Benefit Consultants, LLC [Member]
Sep. 30, 2011
Retail [Member]
Other [Member]
Sep. 30, 2012
Retail [Member]
Insurcorp & GGM Investments LLC [Member]
Sep. 30, 2012
National Programs & Services [Member]
Arrowhead General Insurance Agency Superholding Corporation [Member]
Sep. 30, 2012
Wholesale [Member]
Texas Security General Insurance Agency Inc [Member]
Sep. 30, 2012
Other [Member]
Business Combination, Separately Recognized Transactions [Line Items]                                                
Date of Acquisitio                           Jan. 01, 2011 Jan. 01, 2011 Feb. 01, 2011 Apr. 30, 2011 May 01, 2011 Jun. 01, 2011   May 01, 2012 Jan. 09, 2012 Sep. 01, 2012  
Cash n Paid $ 443,475,000 $ 100,449,000                     $ 100,449,000 $ 8,611,000 $ 12,000,000 $ 14,559,000 $ 24,835,000 $ 6,159,000 $ 9,000,000 $ 25,285,000 $ 15,500,000 $ 397,531,000 $ 14,506,000 $ 15,938,000
Note Payabl 59,000 1,194,000                     1,194,000             1,194,000       59,000
Other e Payabl 25,776,000                   22,594,000                   900,000 22,694,000 2,184,000  
Recorded Earn-out Payable                         15,463,000 1,595,000 1,575,000 3,199,000   888,000 2,038,000 6,168,000        
Earn-ou e Payabl 15,055,000                                       4,944,000 3,634,000 2,124,000 4,353,000
Net Assets Acquired 484,365,000 117,106,000 10,206,000 13,575,000 17,758,000 24,835,000 7,047,000 11,038,000 20,350,000 32,647,000 423,859,000 18,812,000 117,106,000 10,206,000 13,575,000 17,758,000 24,835,000 7,047,000 11,038,000 32,647,000 21,344,000 423,859,000 18,812,000 20,350,000
Maximum Potential Earn-out Payable $ 39,435,000                       $ 42,116,000 $ 5,766,000 $ 6,000,000 $ 9,133,000   $ 3,832,000 $ 4,520,000 $ 12,865,000 $ 17,000,000 $ 5,000,000 $ 7,200,000 $ 10,235,000