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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands	Mar. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	333	79
Less than 12 months, Fair value	$ 611,815	$ 173,670
Less than 12 months, Unrealized losses	$ (15,354)	$ (844)
12 months or longer, Number of issues | security	1	0
12 months or longer, Fair value	$ 1,141	$ 0
12 months or longer, Unrealized losses	$ (32)	$ 0
Fixed Maturities | U.S. government obligations and agencies
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	8	8
Less than 12 months, Fair value	$ 37,127	$ 31,729
Less than 12 months, Unrealized losses	$ (340)	$ (55)
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 | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	211	27
Less than 12 months, Fair value	$ 311,967	$ 28,791
Less than 12 months, Unrealized losses	$ (8,712)	$ (162)
12 months or longer, Number of issues | security	1	0
12 months or longer, Fair value	$ 1,141	$ 0
12 months or longer, Unrealized losses	$ (32)	$ 0
Fixed Maturities | Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	107	42
Less than 12 months, Fair value	$ 249,319	$ 112,462
Less than 12 months, Unrealized losses	$ (5,799)	$ (615)
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 | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	7	0
Less than 12 months, Fair value	$ 13,402	$ 0
Less than 12 months, Unrealized losses	$ (503)	$ 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	0	2
Less than 12 months, Fair value	$ 0	$ 688
Less than 12 months, Unrealized losses	$ 0	$ (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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