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Business Combinations - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Business Acquisition [Line Items]        
Aggregate purchase price of acquisitions $ 519,794,000 $ 667,586,000 $ 214,822,000  
Cash payment for acquisition 408,072,000 483,933,000 167,444,000  
Other payables for acquisition 552,000 25,439,000    
Assumption of liabilities 106,079,000 136,676,000 15,659,000  
Recorded earn-out payables 5,091,000      
Average annual operating profit earned period, minimum (years) 1 year 1 year 1 year  
Average annual operating profit earned period, maximum (years) 3 years 3 years 3 years  
Aggregate purchase price of acquisitions 504,000      
Cash payments for acquisitions 18,000      
Net consideration paid as other note payable 117,000      
Assumption of liabilities 82,000      
Recorded earn-out payable 721,000      
Total goodwill 295,944,000 390,640,000 128,344,000  
Goodwill currently deductible for income tax purposes 41,663,000 52,730,000 84,105,000  
Goodwill currently non-deductible for income tax purposes 249,190,000 316,431,000 13,714,000  
Goodwill related to the recorded earn-out payables 5,091,000 21,479,000 30,525,000  
Total revenues related to acquisitions 63,797,000 129,472,000 40,291,000  
Income (loss) before income taxes related to acquisitions 872,000 898,000    
Net additional consideration paid as note payable   59,000 1,194,000  
Recorded earn-out payable 5,091,000 21,479,000 30,525,000  
Income before income taxes related to acquisitions     7,223,000  
Maximum future contingency payments related to acquisitions 130,584,000      
Percentage recognition by acquirer of fair value of acquired assets 100.00%      
Future earnings of acquired entities, term basis of potential earn-out obligations, minimum (years) 1 year      
Future earnings of acquired entities, term basis of potential earn-out obligations, maximum (years) 3 years      
Estimated acquisition earn-out payables 43,058,000 52,987,000 47,715,000 29,608,000
Accounts Payable [Member]
        
Business Acquisition [Line Items]        
Estimated acquisition earn-out payables 6,312,000 10,164,000    
Purchased customer accounts [Member]
        
Business Acquisition [Line Items]        
Weighted average life (years) 15 years 15 years 15 years  
Non-compete agreements [Member]
        
Business Acquisition [Line Items]        
Weighted average life (years) 5 years 5 years 5 years  
Arrowhead General Insurance Agency Superholding Corporation [Member]
        
Business Acquisition [Line Items]        
Other payables for acquisition   22,061,000    
Total goodwill   321,128,000    
Other Non-Current Liability [Member]
        
Business Acquisition [Line Items]        
Estimated acquisition earn-out payables 36,746,000 42,823,000    
Prior to January 1, 2009 [Member]
        
Business Acquisition [Line Items]        
Cash payment for acquisition 873,000 2,907,000    
Net additional consideration paid as note payable 873,000      
Additional net consideration paid allocated to goodwill 873,000 2,907,000    
Retail [Member]
        
Business Acquisition [Line Items]        
Goodwill assigned 257,196,000 57,856,000    
Goodwill assigned     108,420,000  
National Programs Divisions [Member]
        
Business Acquisition [Line Items]        
Goodwill assigned 27,091,000 289,378,000    
Goodwill assigned     11,853,000  
Wholesale Brokerage Divisions [Member]
        
Business Acquisition [Line Items]        
Goodwill assigned (812,000) 11,656,000    
Services [Member]
        
Business Acquisition [Line Items]        
Goodwill assigned 12,469,000 31,750,000    
Goodwill assigned     $ 8,071,000  
Asset Acquisitions [Member]
        
Business Acquisition [Line Items]        
Number of acquisitions 10 19 1  
Stock Acquisitions [Member]
        
Business Acquisition [Line Items]        
Number of acquisitions 1 1 37