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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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