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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands	Sep. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	171	68
Less than 12 months, Fair value	$ 374,645	$ 79,297
Less than 12 months, Unrealized losses	$ (1,831)	$ (468)
12 months or longer, Number of issues | security	0	42
12 months or longer, Fair value	$ 0	$ 65,802
12 months or longer, Unrealized losses	$ 0	$ (557)
Fixed Maturities [Member] | U.S. Government Obligations and Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	5	2
Less than 12 months, Fair value	$ 32,211	$ 3,836
Less than 12 months, Unrealized losses	$ (6)	$ (108)
12 months or longer, Number of issues | security	0	4
12 months or longer, Fair value	$ 0	$ 23,186
12 months or longer, Unrealized losses	$ 0	$ (80)
Fixed Maturities [Member] | Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	120	18
Less than 12 months, Fair value	$ 223,864	$ 16,808
Less than 12 months, Unrealized losses	$ (1,329)	$ (107)
12 months or longer, Number of issues | security	0	7
12 months or longer, Fair value	$ 0	$ 5,866
12 months or longer, Unrealized losses	$ 0	$ (34)
Fixed Maturities [Member] | Mortgage-Backed and Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	45	42
Less than 12 months, Fair value	$ 115,570	$ 58,023
Less than 12 months, Unrealized losses	$ (495)	$ (245)
12 months or longer, Number of issues | security	0	26
12 months or longer, Fair value	$ 0	$ 34,985
12 months or longer, Unrealized losses	$ 0	$ (361)
Fixed Maturities [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	1	0
Less than 12 months, Fair value	$ 3,000	$ 0
Less than 12 months, Unrealized losses	$ (1)	$ 0
12 months or longer, Number of issues | security	0	1
12 months or longer, Fair value	$ 0	$ 276
12 months or longer, Unrealized losses	$ 0	$ (4)
Fixed Maturities [Member] | Redeemable Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Number of issues | security	0	6
Less than 12 months, Fair value	$ 0	$ 630
Less than 12 months, Unrealized losses	$ 0	$ (8)
12 months or longer, Number of issues | security	0	4
12 months or longer, Fair value	$ 0	$ 1,489
12 months or longer, Unrealized losses	$ 0	$ (78)

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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-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
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+ References

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+ References

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+ References

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