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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Intangible Assets And Goodwill [Line Items] |  |  |
Impairment of goodwill | $ 578,000 | $ 1,123,000 |
Goodwill | 4,820,000 | 5,398,000 | $ 6,521,000
Amortization of definite lived intangible assets | $ 400,000 | 500,000 | 500,000
Weighted average amortization period for definite lived intangible assets | 13 years 7 months 6 days |  |
Net Value | $ 14,000,000.0 | 19,000,000.0 |
Definite lived intangible assets | 800,000 | 1,300,000 |
Accumulated impairment losses | 600,000 | 1,100,000 | 0
State insurance licenses |  |  |
Intangible Assets And Goodwill [Line Items] |  |  |
Net Value | 5,000,000 | 10,000,000 |
Impairment of indefinite lived intangible assets | 5,000,000 |  |
Other Than Agent Relationships |  |  |
Intangible Assets And Goodwill [Line Items] |  |  |
Impairment of definite lived intangible assets | 0 | 0 | 0
Commercial Specialty |  |  |
Intangible Assets And Goodwill [Line Items] |  |  |
Impairment of goodwill | 0 | 0 | 0
Goodwill | 4,820,000 | 4,820,000 | 4,820,000
Farm, Ranch & Stable Business and Specialty Property Business [Member] |  |  |
Intangible Assets And Goodwill [Line Items] |  |  |
Goodwill | 1,700,000 |  |
Farm, Ranch & Stable |  |  |
Intangible Assets And Goodwill [Line Items] |  |  |
Goodwill | $ 600,000 |  |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Cost and Expense, Operating |  |
Impairment of definite lived intangible assets | $ 100,000 |  |
Manufactured and Dwelling Homes Business |  |  |
Intangible Assets And Goodwill [Line Items] |  |  |
Impairment of definite lived intangible assets | 200,000 |  |
Exited Lines Segment |  |  |
Intangible Assets And Goodwill [Line Items] |  |  |
Impairment of goodwill | 578,000 | 1,123,000 |
Goodwill | $ 0 | 578,000 | $ 1,701,000
Impairment of Intangible Asset Statement of Income or Comprehensive Income Extensible Enumeration | Other Cost and Expense, Operating |  |
Impairment of definite lived intangible assets | $ 100,000 | 200,000 |
Exited Lines Segment | State insurance licenses |  |  |
Intangible Assets And Goodwill [Line Items] |  |  |
Net Value | 5,000,000.0 |  |
Impairment of indefinite lived intangible assets | 5,000,000.0 |  |
Exited Lines Segment | Corporate and Other Operating Expenses |  |  |
Intangible Assets And Goodwill [Line Items] |  |  |
Impairment of goodwill | 600,000 | $ 1,100,000 |
Specialty Property Business |  |  |
Intangible Assets And Goodwill [Line Items] |  |  |
Goodwill | $ 1,100,000 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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