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Stock-Based Compensation (Exzeo Plan) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for grant	642,840		642,840
Stock options, outstanding	570,000		570,000		590,000
Exercisable, Number of Options	570,000		570,000
Recognized compensation expenses	$ 3,313	$ 2,695	$ 10,011	$ 8,362
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards outstanding, nonvested	292,241		292,241		494,635
Weighted average grant date fair value	$ 100.93		$ 100.93		$ 73.31
Unrecognized compensation expense related to nonvested stock awards	$ 13,374		$ 13,374
Recognition of remaining compensation expense over a weighted-average period			1 year 10 months 24 days
Exzeo Group Inc \| Share based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for grant	9,838,020		9,838,020
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	2,458,673		2,458,673
Weighted average grant date fair value	$ 4.84		$ 4.84
Unrecognized compensation expense related to nonvested stock awards	$ 9,648		$ 9,648
Recognition of remaining compensation expense over a weighted-average period			3 years 6 months
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 Omnibus 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