Stock-Based Compensation (Subsidiary Equity Plan) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expenses	$ 2,695	$ 2,376	$ 5,667	$ 3,958
Exzeo Group Inc [Member] \| Share based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expenses	701	$ 656	1,403	$ 1,357
Unrecognized compensation expense related to nonvested restricted stock and stock options	$ 7,765		$ 7,765		$ 9,495

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.

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+ Details