Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands		11 Months Ended	12 Months Ended
		Nov. 30, 2022	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Minimum ownership interest percentage for limited partnership accounted investments for using the equity method			5.00%
Unpaid earned premium and credit loss			$ 0
Allowance for uncollectible premiums			3,152	$ 5,362
Increase In Unearned Premiums From Change In Allowance For Uncollectible Premium			2,113
Decrease In Unearned Premiums From Change In Allowance For Uncollectible Premium				3,432
Changes in Earned Revenues			(97)	180	$ 15
Other income			2,628	4,488	6,447
Other assets	[1]		$ 50,365	31,671
Period for establishing allowance on insurance premiums receivable			90 days
Claims Processing Services [Member]
Summary Of Significant Accounting Policies [Line Items]
Other income			$ 766	3,425	$ 4,554
Other assets			$ 0	$ 2,543
Land Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of Property and Equipment			5 years
Building [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of Property and Equipment			39 years
Computer Hardware and Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of Property and Equipment			3 years
Capitalized Software Cost [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of Property and Equipment			7 years
Investment in Joint Venture [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of investment in unconsolidated entities		90.00%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Maximum ownership interest percentage for limited partnership accounted investments for using the net asset value method.			0.05
Operating lease term			9 years
Percentage of voting rights and economic interests in subsidiary threshold			100.00%
Maximum [Member] | Building Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of Property and Equipment			10 years
Maximum [Member] | Furniture and Office Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of Property and Equipment			7 years
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Operating lease term			1 month
Minimum [Member] | Building Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of Property and Equipment			3 years
Minimum [Member] | Furniture and Office Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful lives of Property and Equipment			3 years

[1] See Note 16 for details of balances associated with variable interest entity.