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Business Combinations - Additional Information (Details) $ in Thousands | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) Acquisition | Sep. 30, 2018 USD ($) Acquisition | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 18 | 18 |  |  |  |
Aggregate purchase price of acquisitions | $ (6,600) |  |  |  |  |
Payments to Acquire Businesses, Gross | 291,610 |  |  |  |  |
Net assets acquired | 392,536 |  |  |  |  |
Goodwill, Acquired During Period | 275,307 |  |  |  |  |
Goodwill currently deductible for income tax purposes | 203,800 |  |  |  |  |
Goodwill related to the recorded earn-out payables | 71,500 |  |  |  |  |
Total revenues related to acquisitions | 31,000 |  |  |  |  |
Income before income taxes related to acquisitions | 300 |  |  |  |  |
Estimated acquisition earn-out payables | 146,603 | $ 65,308 | $ 104,976 | $ 89,924 | $ 52,540 | $ 36,175
Maximum Future Contingency payments Acquisitions | 310,600 |  |  |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | 122,900 |  |  |  |  |
Accounts payable |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated acquisition earn-out payables | 23,700 |  |  |  |  |
Retail |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 249,691 |  |  |  |  |
National Programs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 74 |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 6,189 |  |  |  |  |
Services |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period | 19,353 |  |  |  |  |
Goodwill adjusted amount | $ 19,300 |  |  |  |  |
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 | 17 |  |  |  |  |
Business Combinations - Stock Deals |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition | 1 |  |  |  |  |
Other Acquisitions | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net assets acquired | $ 10,000 |  |  |  |  |

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