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Business Combinations - Acquisitions Accounted for Business Combinations (Detail) (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Business Combination, Separately Recognized Transactions [Line Items]    
Cash Paid $ 720,102,000 $ 14,366,000
Other Payable 125,000 85,000
Net Assets Acquired 733,385,000 15,848,000
The Wright Insurance Group, LLC. [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Net Assets Acquired 610,158,000  
Pacific Resources Benefits Advisors, LLC [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Net Assets Acquired 98,819,000  
Axia Strategies, Inc. [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Net Assets Acquired 11,694,000  
Other Acquisitions [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Net Assets Acquired 12,714,000 925,000
Arrowhead General Insurance Agency Superholding Corporation [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Net Assets Acquired   (454,000)
Insurcorp & GGM Investments LLC [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Net Assets Acquired   (834,000)
Richard W. Endlar Insurance Agency, Inc. [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Net Assets Acquired   220,000
Texas Security General Insurance Agency, Inc. [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Net Assets Acquired   (107,000)
The Rollins Agency, Inc. [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Net Assets Acquired   16,098,000
2014 Acquisitions [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Cash Paid 720,102,000  
Other Payable 125,000  
Recorded Earn-Out Payable 13,158,000  
Net Assets Acquired 733,385,000  
Maximum Potential Earn-Out Payable 46,228,000  
2014 Acquisitions [Member] | The Wright Insurance Group, LLC. [Member] | National Programs Divisions [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Effective Date of Acquisition May 01, 2014  
Cash Paid 610,158,000  
Net Assets Acquired 610,158,000  
2014 Acquisitions [Member] | Pacific Resources Benefits Advisors, LLC [Member] | Retail [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Effective Date of Acquisition May 01, 2014  
Cash Paid 90,000,000  
Recorded Earn-Out Payable 8,819,000  
Net Assets Acquired 98,819,000  
Maximum Potential Earn-Out Payable 35,000,000  
2014 Acquisitions [Member] | Axia Strategies, Inc. [Member] | Wholesale Brokerage [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Effective Date of Acquisition May 01, 2014  
Cash Paid 9,870,000  
Recorded Earn-Out Payable 1,824,000  
Net Assets Acquired 11,694,000  
Maximum Potential Earn-Out Payable 5,200,000  
2014 Acquisitions [Member] | Other Acquisitions [Member] | Various [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Cash Paid 10,074,000  
Other Payable 125,000  
Recorded Earn-Out Payable 2,515,000  
Net Assets Acquired 12,714,000  
Maximum Potential Earn-Out Payable 6,028,000  
2013 Acquisitions [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Cash Paid   14,384,000
Other Payable   (369,000)
Recorded Earn-Out Payable   1,833,000
Net Assets Acquired   15,848,000
Maximum Potential Earn-Out Payable   4,748,000
2013 Acquisitions [Member] | Other Acquisitions [Member] | Various [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Cash Paid   592,000
Other Payable   35,000
Recorded Earn-Out Payable   298,000
Net Assets Acquired   925,000
Maximum Potential Earn-Out Payable   448,000
2013 Acquisitions [Member] | Arrowhead General Insurance Agency Superholding Corporation [Member] | National Programs & Services [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Effective Date of Acquisition   Jan. 09, 2012
Other Payable   (454,000)
Net Assets Acquired   (454,000)
2013 Acquisitions [Member] | Insurcorp & GGM Investments LLC [Member] | Retail [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Effective Date of Acquisition   May 01, 2012
Recorded Earn-Out Payable   (834,000)
Net Assets Acquired   (834,000)
2013 Acquisitions [Member] | Richard W. Endlar Insurance Agency, Inc. [Member] | Retail [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Effective Date of Acquisition   May 01, 2012
Recorded Earn-Out Payable   220,000
Net Assets Acquired   220,000
2013 Acquisitions [Member] | Texas Security General Insurance Agency, Inc. [Member] | Wholesale Brokerage [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Effective Date of Acquisition   Sep. 01, 2012
Recorded Earn-Out Payable   (107,000)
Net Assets Acquired   (107,000)
2013 Acquisitions [Member] | The Rollins Agency, Inc. [Member] | Retail [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Effective Date of Acquisition   Jun. 01, 2013
Cash Paid   13,792,000
Other Payable   50,000
Recorded Earn-Out Payable   2,256,000
Net Assets Acquired   16,098,000
Maximum Potential Earn-Out Payable   $ 4,300,000