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Business Combinations - Additional Information (Details) $ in Thousands | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) Acquisition | Sep. 30, 2019 USD ($) Acquisition | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 16 | 18 |  |  |  |
Aggregate purchase price of acquisitions | $ 3,500 |  |  |  |  |
Payments to Acquire Businesses, Gross | 402,358 |  |  |  |  |
Net assets acquired | 518,673 |  |  |  |  |
Goodwill, Acquired During Period | 378,633 |  |  |  |  |
Goodwill currently deductible for income tax purposes | 281,800 |  |  |  |  |
Goodwill related to the recorded earn-out payables | 96,800 |  |  |  |  |
Total revenues related to acquisitions | 52,600 |  |  |  |  |
Loss before income taxes related to acquisitions | 1,200 |  |  |  |  |
Estimated acquisition earn-out payables | 252,296 | $ 146,603 | $ 218,467 | $ 161,513 | $ 104,976 | $ 89,924
Maximum Future Contingency payments Acquisitions | 480,200 |  |  |  |  |
Asset Purchase Agreement |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | 25,000 |  |  |  |  |
Expected minimum calculated earn out payments | 25,000 |  |  |  |  |
Expected maximum deemed earn out payments | $ 25,000 |  |  |  |  |
Expected payment period of earn out payments | will be paid in accordance with the asset purchase agreement in the first quarter of calendar year 2022 |  |  |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | $ 200,400 |  |  |  |  |
Accounts payable |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | 51,900 |  |  |  |  |
Retail |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 114,250 |  |  |  |  |
National Programs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 178,332 |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 85,943 |  |  |  |  |
Services |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 108 |  |  |  |  |
Goodwill adjusted amount | $ 100 |  |  |  |  |
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 |  |  |  |  |
Business Combinations - Asset Deals |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 13 |  |  |  |  |
Business Combinations - Asset Deals and Book of Business Purchases |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 16 |  |  |  |  |
Book of Business Purchases |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 3 |  |  |  |  |
Other Acquisitions | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net assets acquired | $ 10,000 |  |  |  |  |

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