Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 obligation
Revenue, Performance Obligation [Abstract]
Management fee rate as a percent of direct and affiliated assumed written premiums of the Exchange	25.00%
Performance obligations under subscriber's agreement	2
Primary agent bonus
Agent bonus estimates
Period of prior year actual underwriting data used to estimate agent bonuses	2 years
Performance period for agent bonuses	36 months
Secondary agent bonus
Agent bonus estimates
Performance period for agent bonuses	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Period of time over which management fee revenue allocated to administrative services will be recognized	4 years
Software | Minimum
Fixed assets
Estimated useful life	3 years
Software | Maximum
Fixed assets
Estimated useful life	7 years
Buildings and building improvements | Minimum
Fixed assets
Estimated useful life	20 years
Buildings and building improvements | Maximum
Fixed assets
Estimated useful life	45 years
Equipment | Minimum
Fixed assets
Estimated useful life	3 years
Equipment | Maximum
Fixed assets
Estimated useful life	10 years
Furniture and fixtures
Fixed assets
Estimated useful life	7 years
Administrative services expenses | Direct expense
Expense Classification [Line Items]
Percentage of administrative services expenses	71.00%
Administrative services expenses | Allocated expense
Expense Classification [Line Items]
Percentage of administrative services expenses	29.00%