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Supplemental Financial Statement Information - Summary of Rollforward of Insurance Reserve (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Insurance Reserves    
Balance at beginning of period $ 1,068,628 $ 987,064
Reinsurance recoverable at beginning of period (245,179) 0
Additions related to:    
Reserves for current period 55,110 64,468
Change in estimates for prior periods 0 128,045
Losses paid (102,830) (121,161)
Transfer of certain legacy auto insurance liabilities 0 0
Net balance at the end of the period 775,729 1,058,416
Add: Reinsurance recoverable at the end of the period 290,152 0
Balance at end of period $ 1,065,881 $ 1,058,416