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Divestitures (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 01, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on divestitures and sale of investments |  | $ (1,029) | $ 312,941 | $ 394
Brokerage Insurance | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from disposal of subsidiary | $ 534,900 |  |  |
Gain (loss) on divestitures and sale of investments | 312,900 |  |  |
Closing related payment | $ 4,400 |  |  |

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