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Business Combinations - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) acquisition | Sep. 30, 2016 USD ($) acquisition | Apr. 01, 2016 USD ($) | Jan. 01, 2016 USD ($) | Apr. 01, 2015 USD ($) | Jan. 01, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 41,178,000 | $ 41,178,000 |  |  |  |  |
Number of acquisitions | acquisition |  | 6 | 6 |  |  |  |
Aggregate purchase price of acquisitions |  | $ 1,406,263 |  |  |  |  |
Payments to Acquire Businesses, Gross |  | 26,478,000 | $ 115,300,000 |  |  |  |
Goodwill assigned | 27,580,000 | 27,580,000 |  |  |  |  |
Goodwill currently deductible for income tax purposes | 26,248,000 | 26,248,000 |  |  |  |  |
Goodwill related to the recorded earn-out payables | 1,333,000 | 1,333,000 |  |  |  |  |
Total revenues related to acquisitions | 3,191,000 | 3,645,000 |  |  |  |  |
Income before income taxes related to acquisitions | 864,000 | 979,000 |  |  |  |  |
Estimated acquisition earn-out payables | 34,174,000 | 34,174,000 | $ 61,506,000 | $ 57,943,000 | $ 63,821,000 | $ 73,447,000 | $ 78,387,000
Maximum Future Contingency payments Acquisitions | 81,500,000 | 81,500,000 |  |  |  |  |
Accounts payable |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated acquisition earn-out payables | 28,700,000 | $ 28,700,000 |  |  |  |  |
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 | 18,807,000 | $ 18,807,000 |  |  |  |  |
National Programs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill assigned | 7,314,000 | 7,314,000 |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill assigned | 771,000 | 771,000 |  |  |  |  |
Services [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill assigned | 689,000 | 689,000 |  |  |  |  |
Other non-current liability |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated acquisition earn-out payables | 5,500,000 | $ 5,500,000 |  |  |  |  |
Business Combinations - Asset Deals [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of acquisitions | acquisition |  | 6 |  |  |  |  |
Other Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 41,178,000 | $ 41,178,000 |  |  |  |  |
Goodwill assigned | $ 27,580,000 | $ 27,580,000 |  |  |  |  |

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