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Business Combinations - Acquisitions Accounted for Business Combinations (Detail) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Business Combination, Separately Recognized Transactions [Line Items]    
Cash Paid $ 720,102,000 $ 379,694,000
Net Assets Acquired 734,714,000  
The Wright Insurance Group, LLC. [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Net Assets Acquired 611,629,000  
Pacific Resources Benefits Advisors, LLC (PacRes) [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Net Assets Acquired 98,819,000  
Axia Strategies, Inc (Axia) [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 12,572,000  
2014 Acquisitions [Member]
    
Business Combination, Separately Recognized Transactions [Line Items]    
Cash Paid 720,181,000  
Other Payable 1,596,000  
Recorded Earn-Out Payable 12,937,000  
Net Assets Acquired 734,714,000  
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  
Other Payable 1,471,000  
Net Assets Acquired 611,629,000  
2014 Acquisitions [Member] | Pacific Resources Benefits Advisors, LLC (PacRes) [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 (Axia) [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 10,153,000  
Other Payable 125,000  
Recorded Earn-Out Payable 2,294,000  
Net Assets Acquired 12,572,000  
Maximum Potential Earn-Out Payable $ 6,028,000