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Supplemental Financial Statement Information - Summary of Rollforward of Insurance Reserve (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Insurance Reserves    
Beginning balance $ 987,064 $ 1,378,462
Losses paid (121,161) (205,946)
Change in estimates for prior periods 128,045 58,359
Transfer of certain legacy auto insurance liabilities 0 (407,885)
Reserves for current period 64,468 152,142
Ending balance $ 1,058,416 $ 975,132