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Business Combinations - Additional Information (Details) $ in Thousands | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) Acquisition | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 4 |  |  |  |  |
Aggregate purchase price of acquisitions | $ 1,800 |  |  |  |  |
Payments to Acquire Businesses, Gross | 162,752 |  |  |  |  |
Net assets acquired | 194,612 |  |  |  |  |
Goodwill, Acquired During Period | 121,828 |  |  |  |  |
Goodwill currently deductible for income tax purposes | 96,700 |  |  |  |  |
Goodwill related to the recorded earn-out payables | 25,100 |  |  |  |  |
Total revenues related to acquisitions | 17,500 |  |  |  |  |
Loss before income taxes related to acquisitions | 100 |  |  |  |  |
Estimated acquisition earn-out payables | 242,016 | $ 257,566 | $ 258,943 | $ 218,467 | $ 157,720 | $ 161,513
Maximum Future Contingency payments Acquisitions | 543,200 |  |  |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | 153,200 |  |  |  |  |
Accounts payable |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | 88,800 |  |  |  |  |
Retail |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 122,612 |  |  |  |  |
National Programs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | (1,337) |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | $ 553 |  |  |  |  |
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 | 1 |  |  |  |  |
Assets and Assumed Certain Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 2 |  |  |  |  |
Book of Business Purchases |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 1 |  |  |  |  |
Other Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net assets acquired | $ 2,285 |  |  |  |  |
Other Acquisitions | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net assets acquired | $ 20,000 |  |  |  |  |

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