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Business Combinations - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) acquisition customer_account | Sep. 30, 2014 USD ($) acquisition | Jul. 01, 2015 USD ($) | Jan. 01, 2015 USD ($) | Jul. 01, 2014 USD ($) | Jan. 01, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of acquisitions | acquisition |  | 9 | 6 |  |  |  |
Number of customer accounts acquired | customer_account |  | 4 |  |  |  |  |
Aggregate purchase price of acquisitions |  | $ 503,442 |  |  |  |  |
Payments to Acquire Businesses, Gross |  | 109,926,000 | $ 720,100,000 |  |  |  |
Goodwill assigned | $ 100,632,000 | 100,632,000 |  |  |  |  |
Goodwill currently deductible for income tax purposes | 62,735,000 | 62,735,000 |  |  |  |  |
Goodwill currently non-deductible for income tax purposes | 8,401,000 | 8,401,000 |  |  |  |  |
Goodwill related to the recorded earn-out payables | 29,496,000 | 29,496,000 |  |  |  |  |
Total revenues related to acquisitions | 9,218,000 | 16,640,000 |  |  |  |  |
Income before income taxes related to acquisitions | 397,000 | 1,243,000 |  |  |  |  |
Estimated acquisition earn-out payables | 80,036,000 | 80,036,000 | $ 52,326,000 | $ 90,113,000 | $ 75,283,000 | $ 52,696,000 | $ 43,058,000
Accounts payable |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated acquisition earn-out payables | 32,300,000 | $ 32,300,000 |  |  |  |  |
Purchased customer accounts |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average life (years) |  | 15 years |  |  |  |  |
Non-compete agreements |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average life (years) |  | 5 years |  |  |  |  |
Retail |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill assigned | 78,018,000 | $ 78,018,000 |  |  |  |  |
National Programs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill assigned | 18,009,000 | 18,009,000 |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill assigned | 4,605,000 | 4,605,000 |  |  |  |  |
Other non-current liability |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated acquisition earn-out payables | $ 47,700,000 | $ 47,700,000 |  |  |  |  |

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