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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands | Jun. 30, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 37 | 68
Less than 12 months, Fair value | $ 34,038 | $ 79,297
Less than 12 months, Unrealized losses | $ (833) | $ (468)
12 months or longer, Number of issues | security | 5 | 42
12 months or longer, Fair value | $ 2,503 | $ 65,802
12 months or longer, Unrealized losses | $ (41) | $ (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 | 1 | 2
Less than 12 months, Fair value | $ 1,995 | $ 3,836
Less than 12 months, Unrealized losses | $ (5) | $ (108)
12 months or longer, Number of issues | security | 1 | 4
12 months or longer, Fair value | $ 129 | $ 23,186
12 months or longer, Unrealized losses | $ (2) | $ (80)
Fixed Maturities [Member] | Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 14 | 18
Less than 12 months, Fair value | $ 7,463 | $ 16,808
Less than 12 months, Unrealized losses | $ (520) | $ (107)
12 months or longer, Number of issues | security | 1 | 7
12 months or longer, Fair value | $ 223 | $ 5,866
12 months or longer, Unrealized losses | $ (31) | $ (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 | 20 | 42
Less than 12 months, Fair value | $ 24,546 | $ 58,023
Less than 12 months, Unrealized losses | $ (308) | $ (245)
12 months or longer, Number of issues | security | 3 | 26
12 months or longer, Fair value | $ 2,151 | $ 34,985
12 months or longer, Unrealized losses | $ (8) | $ (361)
Fixed Maturities [Member] | Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security |  | 0
Less than 12 months, Fair value |  | $ 0
Less than 12 months, Unrealized losses |  | $ 0
12 months or longer, Number of issues | security |  | 1
12 months or longer, Fair value |  | $ 276
12 months or longer, Unrealized losses |  | $ (4)
Fixed Maturities [Member] | Redeemable Preferred Stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 2 | 6
Less than 12 months, Fair value | $ 34 | $ 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)

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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=121582814&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=121645371&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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