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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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