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Business Combinations - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) Acquisition | Dec. 31, 2020 USD ($) Acquisition | Dec. 31, 2019 USD ($) Acquisition | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | Acquisition | 19 | 25 |  |
Aggregate purchase price of acquisitions | $ (500) | $ 3,500 | $ 4,100 |
Payments to Acquire Businesses, Gross | 424,600 | 722,500 |  |
Goodwill, Acquired During Period | 349,973 | 648,095 | 328,500 |
Goodwill currently deductible for income tax purposes | 179,100 | 516,700 | 245,600 |
Goodwill related to the recorded earn-out payables | 53,000 | 131,400 | 82,900 |
Total revenues related to acquisitions | 63,800 | 93,900 | 49,100 |
Income before income taxes related to acquisitions | 10,600 | 7,500 | 3,400 |
Maximum Future Contingency payments Acquisitions | 484,800 |  |  |
Estimated acquisition earn-out payables | 291,047 | 258,943 | 161,513 | $ 89,924
Other Liabilities |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | 212,600 | 179,700 | 143,600 |
Accounts payable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | 78,400 | 79,200 | 17,900 |
Retail |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period | 345,961 | 299,961 | 302,600 |
National Programs |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period | (1,337) | 163,070 | 100 |
Wholesale Brokerage |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period | 5,349 | 184,956 | 6,500 |
Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Acquired During Period | $ 0 | $ 108 | $ 19,300 |
Purchased Customer Accounts |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 15 years | 15 years | 15 years |
Non-compete Agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 5 years | 5 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 | 13 | 20 | 22 |
Business Combinations - Stock Deals |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | Acquisition | 2 | 1 | 1 |
Book of Business Purchases |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | Acquisition | 3 | 4 | 4 |
O'Leary and Remedy |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill currently non-deductible for income tax purposes | $ 117,900 |  |  |

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