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Business Combinations - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Y
Sep. 30, 2011
Y
Sep. 30, 2012
Arrowhead General Insurance Agency Superholding Corporation [Member]
Sep. 30, 2012
Accounts Payable [Member]
Sep. 30, 2011
Accounts Payable [Member]
Sep. 30, 2012
Other Non-Current Liability [Member]
Sep. 30, 2011
Other Non-Current Liability [Member]
Sep. 30, 2012
Purchased Customer Accounts [Member]
Sep. 30, 2011
Purchased Customer Accounts [Member]
Sep. 30, 2012
Non Compete Agreements [Member]
Sep. 30, 2011
Non Compete Agreements [Member]
Sep. 30, 2012
Asset Acquisitions [Member]
Entity
Sep. 30, 2011
Asset Acquisitions [Member]
Entity
Sep. 30, 2012
Prior To January 1, 2009 [Member]
Dec. 31, 2011
Prior To January 1, 2009 [Member]
Sep. 30, 2012
Stock Acquisitions [Member]
Entity
Sep. 30, 2012
Retail [Member]
Sep. 30, 2011
Retail [Member]
Sep. 30, 2012
National Programs Divisions [Member]
Sep. 30, 2012
Wholesale Brokerage Divisions [Member]
Sep. 30, 2012
Services [Member]
Sep. 30, 2012
Subsequent To January 1, 2009 [Member]
Y
Number of acquisitions                           11 29     1            
Aggregate purchase price of acquisitions $ 620,144,000 $ 126,462,000 $ 620,144,000 $ 126,462,000                                        
Cash payments for acquisitions 443,475,000 100,449,000 443,475,000 100,449,000                       3,781,000       100,449,000        
Net additional consideration paid as note payable 59,000   59,000                           4,446,000              
Other Payable 25,776,000   25,776,000   22,594,000                                      
Assumption of liabilities 135,779,000 9,356,000 135,779,000 9,356,000                                        
Recorded earn-out payable     15,055,000 15,463,000                                        
Average annual operating profit earned period, minimum (years)     1 1                                        
Average annual operating profit earned period, maximum (years)     3 3                                        
Weighted average life (years)                   15 years 15 years 5 years 5 years                      
Total goodwill 361,118,000 73,576,000 361,118,000 73,576,000                                        
Goodwill currently deductible for income tax purposes 28,326,000 43,412,000 28,326,000 43,412,000                                        
Goodwill currently non-deductible for income tax purposes 317,737,000   317,737,000                                          
Goodwill assigned                                     26,753,000   253,766,000 11,586,000 69,013,000  
Goodwill related to the recorded earn-out payables 15,055,000 15,463,000 15,055,000 15,463,000                                        
Total revenues related to acquisitions 37,754,000 1,471,000 96,020,000 3,026,000                                        
Income before income taxes related to acquisitions 4,731,000 894,000 4,279,000 1,832,000                                        
Net additional consideration, issued as a note payable 59,000 1,194,000 59,000 1,194,000                       665,000       1,194,000        
Business Acquisitions During Period Purchase Price Allocation Goodwill Expected Tax Deductible Amount                                     71,287,000   2,289,000      
Goodwill currently non-deductible for income tax purposes   14,701,000   14,701,000                                        
Additional net consideration paid allocated to goodwill                               2,907,000 4,446,000              
Additional consideration paid in cash                               2,907,000                
Maximum future contingency payments related to acquisitions 148,950,000   148,950,000                                         148,950,000
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
Future earnings of acquired entities, term basis of potential earn-out obligations, maximum (years)                                               3
Estimated acquisition earn-out payables $ 58,248,000 $ 40,461,000 $ 58,248,000 $ 40,461,000   $ 17,552,000 $ 7,365,000 $ 40,696,000 $ 33,096,000