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Investments - Summary of Fixed Maturities with Unrealized Losses (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 178,424 | $ 67,740
Less Than 12 Months, Unrealized Losses | 2,666 | 629
More Than 12 Months, Fair Value | 3,862 | 8,466
More Than 12 Months, Unrealized Losses | 127 | 277
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 38,202 | 29,144
Less Than 12 Months, Unrealized Losses | 1,088 | 345
Obligations of States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 45,446 | 9,362
Less Than 12 Months, Unrealized Losses | 819 | 154
More Than 12 Months, Fair Value | 0 |
More Than 12 Months, Unrealized Losses | 0 |
Corporate Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 38,846 | 26,143
Less Than 12 Months, Unrealized Losses | 344 | 115
More Than 12 Months, Fair Value | 3,375 | 8,230
More Than 12 Months, Unrealized Losses | 125 | 276
Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 55,930 | 3,091
Less Than 12 Months, Unrealized Losses | 415 | 15
More Than 12 Months, Fair Value | 487 | 236
More Than 12 Months, Unrealized Losses | $ 2 | $ 1

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