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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail) $ in Thousands | Jun. 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 | 59 | 331
Less than 12 months, Fair value | $ 29,918 | $ 279,093
Less than 12 months, Unrealized losses | $ (142) | $ (4,063)
12 months or longer, Number of issues | security | 167 | 281
12 months or longer, Fair value | $ 218,442 | $ 337,226
12 months or longer, Unrealized losses | $ (1,792) | $ (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 | 0 | 0
Less than 12 months, Fair value | $ 0 | $ 0
Less than 12 months, Unrealized losses | $ 0 | $ 0
12 months or longer, Number of issues | security | 9 | 13
12 months or longer, Fair value | $ 46,478 | $ 56,531
12 months or longer, Unrealized losses | $ (314) | $ (1,039)
Fixed Maturities [Member] | Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 23 | 228
Less than 12 months, Fair value | $ 12,768 | $ 210,152
Less than 12 months, Unrealized losses | $ (28) | $ (3,318)
12 months or longer, Number of issues | security | 79 | 160
12 months or longer, Fair value | $ 68,066 | $ 131,225
12 months or longer, Unrealized losses | $ (307) | $ (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 | 10 | 36
Less than 12 months, Fair value | $ 13,813 | $ 57,487
Less than 12 months, Unrealized losses | $ (67) | $ (196)
12 months or longer, Number of issues | security | 71 | 103
12 months or longer, Fair value | $ 102,029 | $ 148,436
12 months or longer, Unrealized losses | $ (1,058) | $ (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 | $ 274 | $ 0
12 months or longer, Unrealized losses | $ (6) | $ 0
Fixed Maturities [Member] | Redeemable Preferred Stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 26 | 61
Less than 12 months, Fair value | $ 3,337 | $ 8,092
Less than 12 months, Unrealized losses | $ (47) | $ (506)
12 months or longer, Number of issues | security | 7 | 5
12 months or longer, Fair value | $ 1,595 | $ 1,034
12 months or longer, Unrealized losses | $ (107) | $ (132)

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