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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
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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

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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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