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Statutory Accounting and Regulation - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statutory Accounting Practices
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	$ (135,943)	$ 341,630
Statutory Accounting Practices, Statutory Net Income Amount	(455,706)	(83,958)	$ (28,326)
UPC Insurance
Statutory Accounting Practices
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	(239,606)	169,244
Statutory Accounting Practices, Statutory Net Income Amount	(469,801)	(45,078)	(19,487)
American Coastal Insurance Company
Statutory Accounting Practices
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	77,511	142,138
Statutory Accounting Practices, Statutory Net Income Amount	16,516	(34,588)	(7,429)
Interboro Insurance
Statutory Accounting Practices
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	26,152	30,248
Statutory Accounting Practices, Statutory Net Income Amount	(2,421)	$ (4,292)	$ (1,410)
UPC, Subsidiary
Statutory Accounting Practices
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries	0
American Coastal Insurance Company
Statutory Accounting Practices
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries	19,603
Interboro Insurance Company
Statutory Accounting Practices
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries	$ 20,774

X

- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(e)(3)(ii))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

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- Definition

Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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