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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands	Sep. 30, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	334	79
Less than 12 months, Fair value	$ 567,816	$ 173,670
Less than 12 months, Unrealized losses	$ (7,914)	$ (844)
12 months or longer, Number of issues | security	14	0
12 months or longer, Fair value	$ 20,197	$ 0
12 months or longer, Unrealized losses	$ (666)	$ 0
Fixed Maturities | U.S. government obligations and agencies
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	5	8
Less than 12 months, Fair value	$ 21,069	$ 31,729
Less than 12 months, Unrealized losses	$ (145)	$ (55)
12 months or longer, Number of issues | security	2	0
12 months or longer, Fair value	$ 1,981	$ 0
12 months or longer, Unrealized losses	$ (132)	$ 0
Fixed Maturities | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	216	27
Less than 12 months, Fair value	$ 304,464	$ 28,791
Less than 12 months, Unrealized losses	$ (4,143)	$ (162)
12 months or longer, Number of issues | security	7	0
12 months or longer, Fair value	$ 12,896	$ 0
12 months or longer, Unrealized losses	$ (339)	$ 0
Fixed Maturities | Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	108	42
Less than 12 months, Fair value	$ 232,904	$ 112,462
Less than 12 months, Unrealized losses	$ (3,425)	$ (615)
12 months or longer, Number of issues | security	5	0
12 months or longer, Fair value	$ 5,320	$ 0
12 months or longer, Unrealized losses	$ (195)	$ 0
Fixed Maturities | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	4	0
Less than 12 months, Fair value	$ 8,881	$ 0
Less than 12 months, Unrealized losses	$ (199)	$ 0
12 months or longer, Number of issues | security	0	0
12 months or longer, Fair value	$ 0	$ 0
12 months or longer, Unrealized losses	$ 0	$ 0
Fixed Maturities | Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	1	2
Less than 12 months, Fair value	$ 498	$ 688
Less than 12 months, Unrealized losses	$ (2)	$ (12)
12 months or longer, Number of issues | security	0	0
12 months or longer, Fair value	$ 0	$ 0
12 months or longer, Unrealized losses	$ 0	$ 0

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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+ References

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