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Business Combinations - Purchase Price Allocation for Current Year Acquisitions and Adjustments Made for Prior Year Acquisitions (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 01, 2021 | May 01, 2021 | Jan. 01, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Cash paid |  |  |  |  |  |  | $ 224,141
Common stock issued |  |  |  | $ 4,892 | $ 5,120 | $ 10,000 | 4,892
Other payable |  |  |  |  |  |  | 27,609
Recorded earn-out payable |  |  |  |  |  |  | 25,163
Net assets acquired |  |  |  |  |  |  | 281,805
Maximum potential earn- out payable |  |  |  |  |  |  | 61,252
O'Leary Insurances (O'Leary) |  |  |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  | 137,648
O'Leary Insurances (O'Leary) | Retail |  |  |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Effective date of acquisition |  |  | Jan. 01, 2021 |  |  |  |
Cash paid |  |  | $ 117,408 |  |  |  |
Common stock issued |  |  | 4,892 |  |  |  |
Recorded earn-out payable |  |  | 15,348 |  |  |  |
Net assets acquired |  |  | 137,648 |  |  |  |
Maximum potential earn- out payable |  |  | $ 30,575 |  |  |  |
Piper Jordan LLC (Piper) |  |  |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  | 54,679
Piper Jordan LLC (Piper) | Retail |  |  |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Effective date of acquisition |  | May 01, 2021 |  |  |  |  |
Cash paid |  | $ 43,428 |  |  |  |  |
Other payable |  | 1,397 |  |  |  |  |
Recorded earn-out payable |  | 9,854 |  |  |  |  |
Net assets acquired |  | 54,679 |  |  |  |  |
Maximum potential earn- out payable |  | $ 15,000 |  |  |  |  |
Berkshire Insurance Group, Inc. (Berkshire) |  |  |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  | 41,500
Berkshire Insurance Group, Inc. (Berkshire) | Retail |  |  |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Effective date of acquisition | Sep. 01, 2021 |  |  |  |  |  |
Cash paid | $ 41,500 |  |  |  |  |  |
Net assets acquired | $ 41,500 |  |  |  |  |  |
AGIS Network Inc. (AGIS) |  |  |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  | 36,056
AGIS Network Inc. (AGIS) | Retail |  |  |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Effective date of acquisition | Sep. 01, 2021 |  |  |  |  |  |
Cash paid | $ 11,203 |  |  |  |  |  |
Other payable | 24,114 |  |  |  |  |  |
Recorded earn-out payable | 739 |  |  |  |  |  |
Net assets acquired | 36,056 |  |  |  |  |  |
Maximum potential earn- out payable | $ 12,289 |  |  |  |  |  |
Other Acquisitions |  |  |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  | 11,922
Other Acquisitions | Various |  |  |  |  |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Cash paid |  |  |  |  |  |  | 10,602
Other payable |  |  |  |  |  |  | 2,098
Recorded earn-out payable |  |  |  |  |  |  | (778)
Net assets acquired |  |  |  |  |  |  | 11,922
Maximum potential earn- out payable |  |  |  |  |  |  | $ 3,388

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