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Business Combinations - Additional Information (Detail) | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) acquisition customer_account | Jun. 30, 2015 USD ($) acquisition | Apr. 01, 2016 USD ($) | Jan. 01, 2016 USD ($) | Apr. 01, 2015 USD ($) | Jan. 01, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | acquisition | 5 | 7 |  |  |  |
Aggregate purchase price of acquisitions | $ 917,497 |  |  |  |  |
Payments to Acquire Businesses, Gross | 109,384,000 | $ 105,100,000 |  |  |  |
Goodwill assigned | 78,664,000 |  |  |  |  |
Goodwill currently deductible for income tax purposes | 54,920,000 |  |  |  |  |
Goodwill currently non-deductible for income tax purposes | 21,351,000 |  |  |  |  |
Goodwill related to the recorded earn-out payables | 2,393,000 |  |  |  |  |
Total revenues related to acquisitions | 8,870,000 |  |  |  |  |
Income before income taxes related to acquisitions | 1,400,000 |  |  |  |  |
Estimated acquisition earn-out payables | 73,454,000 | $ 90,113,000 | $ 69,095,000 | $ 78,387,000 | $ 77,709,000 | $ 75,283,000
Accounts payable |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | $ 38,700,000 |  |  |  |  |
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 |  |  |  |  |
Services |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill assigned | $ 6,366,000 |  |  |  |  |
National Programs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill assigned | (1,000) |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill assigned | 49,978,000 |  |  |  |  |
Services [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill assigned | 22,321,000 |  |  |  |  |
Other non-current liability |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | $ 34,800,000 |  |  |  |  |
Business Combinations - Asset Deals [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | acquisition | 4 |  |  |  |  |
Business Combinations - Stock Deals [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | customer_account | 1 |  |  |  |  |

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