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Divestitures (Detail) - USD ($)
12 Months Ended
Nov. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (loss) on divestitures and sale of investments   $ 312,941,000 $ 394,000 $ 18,421,000
Brokerage Insurance        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (loss) on divestitures and sale of investments     $ 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 sale of business $ 534,900,000      
Gain (loss) on divestitures and sale of investments 312,900,000      
Closing related payment $ 4,400,000      
Sale of CSC        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain (loss) on divestitures and sale of investments       $ 18,400,000