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Supplemental Financial Statement Information - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Feb. 08, 2023
Jun. 21, 2022
Apr. 22, 2021
Apr. 03, 2020
Mar. 31, 2020
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash And Restricted Cash                  
Allowance for credit loss on marketable and non-marketable available for sale debt securities             $ 0    
Depreciation and amortization             154,798,000 $ 139,347,000 $ 157,353,000
Transfer of certain legacy auto insurance liabilities       $ 407,900,000          
Loss recognized from net cost of novation agreement               64,700,000  
Reinsurance recoverables             4,000,000    
Funds withheld             1,000,000    
Consideration received for commutation of reinsurance agreement, funds withheld for liability   $ 90,300,000              
Realized gain from commutation of reinsurance agreement           $ 36,800,000      
Decrease in reinsurance recoverable   247,400,000              
Reinsurance amortized deferred gains related to losses ceded   105,700,000              
Deferred gain related to the Reinsurance Transaction             2,357,000 52,785,000  
DARAG Bermuda LTD                  
Cash And Restricted Cash                  
Reserves for current period     $ 183,200,000            
Reinsurance recoverables     251,300,000            
Funds withheld     271,500,000            
Funds withheld liability balance included in accrued and other current liabilities     20,200,000            
Clarendon National Insurance Company | Cost of revenue                  
Cash And Restricted Cash                  
Loss recognized from net cost of novation agreement               62,500,000  
Clarendon National Insurance Company | General and administrative                  
Cash And Restricted Cash                  
Loss recognized from net cost of novation agreement               2,200,000  
Clarendon National Insurance Company | Pacific Valley Insurance Company, Inc.                  
Cash And Restricted Cash                  
Transfer of reinsurance obligations       $ 465,000,000 $ 465,000,000        
Reinsurance obligations               816,000,000  
DARAG Bermuda LTD | Cost of revenue                  
Cash And Restricted Cash                  
Loss recognized from net cost of novation agreement               20,200,000  
DARAG Bermuda LTD | General and administrative                  
Cash And Restricted Cash                  
Loss recognized from net cost of novation agreement               200,000  
DARAG Bermuda LTD | Pacific Valley Insurance Company, Inc.                  
Cash And Restricted Cash                  
Transfer of certain legacy auto insurance liabilities     251,300,000            
Loss recognized from net cost of novation agreement               20,400,000  
Reinsurance obligations     434,500,000            
Unearned premiums     271,500,000            
Insurance liability, collateralized amount     $ 75,000,000            
Consideration received for commutation of reinsurance agreement, assets   89,300,000              
Consideration received for commutation of reinsurance agreement, funds withheld for liability   90,300,000              
Consideration received for commutation of reinsurance agreement   178,600,000              
Reinsurance premium   1,000,000              
DARAG Bermuda LTD | DNA Insurance Company                  
Cash And Restricted Cash                  
Liability for future policy benefits before reinsurance   20,000,000              
Liability for future policy benefits option to commute, amount   $ 5,000,000              
DNA Insurance Company | Pacific Valley Insurance Company, Inc. | Subsequent Event                  
Cash And Restricted Cash                  
Realized gain from commutation of reinsurance agreement $ 3,400,000                
Decrease in reinsurance recoverable 4,000,000                
Settlement amount 5,000,000                
Proceeds from settlement 4,000,000                
Premiums released 1,000,000                
Amortization of remaining realized gain $ 2,400,000                
Property, Plant and Equipment                  
Cash And Restricted Cash                  
Depreciation and amortization             $ 127,800,000 $ 115,300,000 $ 121,000,000