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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2022 USD ($) Entity | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Ownership interest exceeds respective investments | 3.00% |  |
Investments in other invested assets | $ 38,176,000 | $ 152,651,000 |
Cash and cash equivalents | 38,846,000 | 78,278,000 |
Allowance for expected credit losses | 3,322,000 | 2,996,000 | $ 2,900,000
Allowance for expected credit losses on reinsurance receivables | 8,992,000 | 8,992,000 | 8,992,000
Amortization of deferred acquisition costs | 150,900,000 | 144,900,000 | 140,900,000
Premium deficiency reserve | 0 | 0 |
Net foreign currency transaction gains (losses) | 300,000 | 500,000 | $ 100,000
Money Market Funds |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash and cash equivalents | $ 26,000,000.0 | 65,400,000 |
Variable Interest Entity, Not Primary Beneficiary |  |  |
Significant Accounting Policies [Line Items] |  |  |
Ownership interest exceeds respective investments | 3.00% |  |
Number of VIEs | Entity | 2 |  |
Other Assets |  |  |
Significant Accounting Policies [Line Items] |  |  |
Accrued interest receivable | $ 8,400,000 | $ 5,200,000 |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3044-108585 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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