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Stock-Based Compensation (Exzeo Plan) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for grant	641,937		641,937
Stock options, outstanding	570,000		570,000		590,000
Exercisable, Number of Options	570,000		570,000
Recognized compensation expenses	$ 3,339	$ 2,695	$ 6,698	$ 5,667
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards outstanding, nonvested	294,744		294,744		494,635
Weighted average grant date fair value	$ 100.99		$ 100.99		$ 73.31
Unrecognized compensation expense related to nonvested stock awards	$ 16,089		$ 16,089
Recognition of remaining compensation expense over a weighted-average period			2 years
Exzeo Group Inc \| Share based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for grant	9,768,170		9,768,170
Exzeo Group Inc \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, outstanding	6,350,000		6,350,000
Weighted-average exercise price			$ 23
Exzeo Group Inc \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards outstanding, nonvested	2,541,953		2,541,953
Weighted average grant date fair value	$ 4.82		$ 4.82
Unrecognized compensation expense related to nonvested stock awards	$ 10,599		$ 10,599
Recognition of remaining compensation expense over a weighted-average period			3 years 9 months 18 days
Exzeo Group Inc \| Board Approval Required \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable, Number of Options	6,000,000		6,000,000
Exzeo Group Inc \| 2021 Equity Incentive Plan [Member] \| Share based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
No of shares authorized	10,000,000		10,000,000