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Divestitures (Detail) - USD ($)
12 Months Ended
Nov. 01, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (loss) on divestitures and sale of investments   $ 0 $ (1,029,000) $ 312,941,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (loss) on divestitures and sale of investments   $ 0 $ 0  
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 $ 534,900,000      
Gain (loss) on divestitures and sale of investments 312,900,000      
Closing related payment $ 4,400,000