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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |
Retained income | $ 198,092 |  | $ 183,365
Minimum ownership interest percentage for limited partnerships accounted investments for using equity method | 5.00% |  |
Unpaid earned premium and credit loss | $ 0 |  |
Allowance for uncollectible premiums | $ 2,369 |  | $ 528
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Ownership interest to estimate net asset value method | 5.00% |  |
Allowance for Credit Losses [Member] | Reinsurance Recoverable [Member] | ASU 2016-13 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Retained income |  | $ (453) |

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