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Investments - Summarized Fair Value and Gross Unrealized Losses on Available-for-sale Debt Securities (Detail)
$ in Thousands
Jun. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 292 79
Less than 12 months, Fair value $ 526,976 $ 173,670
Less than 12 months, Unrealized losses $ (8,283) $ (844)
12 months or longer, Number of issues | security 2 0
12 months or longer, Fair value $ 1,514 $ 0
12 months or longer, Unrealized losses $ (4) $ 0
Fixed Maturities | U.S. government obligations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 8 8
Less than 12 months, Fair value $ 34,227 $ 31,729
Less than 12 months, Unrealized losses $ (279) $ (55)
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 | Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 178 27
Less than 12 months, Fair value $ 255,550 $ 28,791
Less than 12 months, Unrealized losses $ (3,967) $ (162)
12 months or longer, Number of issues | security 1 0
12 months or longer, Fair value $ 1,099 $ 0
12 months or longer, Unrealized losses $ (2) $ 0
Fixed Maturities | Mortgage-backed and asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Number of issues | security 102 42
Less than 12 months, Fair value $ 228,270 $ 112,462
Less than 12 months, Unrealized losses $ (3,885) $ (615)
12 months or longer, Number of issues | security 1 0
12 months or longer, Fair value $ 415 $ 0
12 months or longer, Unrealized losses $ (2) $ 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 $ 8,929 $ 0
Less than 12 months, Unrealized losses $ (152) $ 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 0 2
Less than 12 months, Fair value $ 0 $ 688
Less than 12 months, Unrealized losses $ 0 $ (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