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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands | Sep. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 60 | 331
Less than 12 months, Fair value | $ 59,989 | $ 279,093
Less than 12 months, Unrealized losses | $ (304) | $ (4,063)
12 months or longer, Number of issues | security | 75 | 281
12 months or longer, Fair value | $ 117,606 | $ 337,226
12 months or longer, Unrealized losses | $ (696) | $ (8,548)
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 | 2 | 0
Less than 12 months, Fair value | $ 3,907 | $ 0
Less than 12 months, Unrealized losses | $ (38) | $ 0
12 months or longer, Number of issues | security | 6 | 13
12 months or longer, Fair value | $ 41,419 | $ 56,531
12 months or longer, Unrealized losses | $ (168) | $ (1,039)
Fixed Maturities [Member] | Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 24 | 228
Less than 12 months, Fair value | $ 24,357 | $ 210,152
Less than 12 months, Unrealized losses | $ (115) | $ (3,318)
12 months or longer, Number of issues | security | 22 | 160
12 months or longer, Fair value | $ 19,923 | $ 131,225
12 months or longer, Unrealized losses | $ (83) | $ (3,418)
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 | 26 | 36
Less than 12 months, Fair value | $ 30,609 | $ 57,487
Less than 12 months, Unrealized losses | $ (139) | $ (196)
12 months or longer, Number of issues | security | 38 | 103
12 months or longer, Fair value | $ 53,895 | $ 148,436
12 months or longer, Unrealized losses | $ (370) | $ (3,959)
Fixed Maturities [Member] | Municipal Bonds [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 | $ 3,362
Less than 12 months, Unrealized losses | $ 0 | $ (43)
12 months or longer, Number of issues | security | 1 | 0
12 months or longer, Fair value | $ 275 | $ 0
12 months or longer, Unrealized losses | $ (5) | $ 0
Fixed Maturities [Member] | Redeemable Preferred Stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 8 | 61
Less than 12 months, Fair value | $ 1,116 | $ 8,092
Less than 12 months, Unrealized losses | $ (12) | $ (506)
12 months or longer, Number of issues | security | 8 | 5
12 months or longer, Fair value | $ 2,094 | $ 1,034
12 months or longer, Unrealized losses | $ (70) | $ (132)

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