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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Decrease to retained earnings for the cumulative after-tax effect of adopting ASC 326 | $ (567,512,000) |  | $ (573,619,000)
Maximum maturity period of highly liquid investments | 3 months |  |
Accrued interest receivable on available-for-sale securities | $ 3,600,000 |  |
Allowances for doubtful accounts | 600,000 |  | 700,000
Accruals for premium deficiency | 0 |  | 0
Reinsurance Recoverable, Allowance for Credit Loss | 0 |  | 0
Fair value, assets, level 1 to level 2 transfers | 0 |  | 0
Fair value, assets, level 2 to level 1 transfers | 0 |  | 0
Fair value, liabilities, level 1 to level 2 transfers | 0 |  | 0
Fair value, liabilities, level 2 to level 1 transfers | $ 0 |  | $ 0
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Decrease to retained earnings for the cumulative after-tax effect of adopting ASC 326 |  | $ 600,000 |
Software [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Useful life of property and equipment | 3 years |  |
Minimum [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Short-term investment maturity period | 3 months |  |
Useful life of property and equipment | 3 years |  |
Maximum [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Useful life of property and equipment | 27 years 6 months |  |

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