Summary of Significant Accounting Policies and New Accounting Standards (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2022 GBP (£) segment	Dec. 31, 2021 USD ($)	Aug. 31, 2022	Jan. 31, 2022	Jan. 01, 2022 USD ($)	Dec. 02, 2021
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Amount retained	$ 10,000,000	£ 1,000,000
Number of operating segments | segment	1	1
Number of reportable segments | segment	1	1
Impairment of operating lease right-of-use assets	$ 4,698,000		$ 0
Goodwill, impairment loss	$ 0		0
Membership period	1 year	1 year
Advertising expense	$ 27,800,000		24,100,000
Tax benefit distributions to noncontrolling interest holders, percent							85.00%
Tax benefit retained by parent, percent							15.00%
Annual exposure limit	11,400,000		10,800,000
Losses and loss adjustment expenses	182,402,000		122,080,000
Self insurance reserve	$ 1,200,000		900,000
Matching contribution	4.00%	4.00%
Defined contribution plan	$ 6,200,000		4,900,000
Media content	5,580,000		3,335,000
Operating lease ROU assets	82,398,000		0			$ 72,800,000
Total lease liabilities	88,328,000					72,800,000
Accumulated earnings (deficit)	(489,602,000)		(482,276,000)
Accounting Standards Update 2020-05
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Accumulated earnings (deficit)						$ 4,300,000
Broad Arrow Group, Inc.
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Equity method investment, ownership percentage					40.00%
Broad Arrow Group, Inc.
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Business combination, percentage of voting interest acquired				60.00%
Labor And Related Expense
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Losses and loss adjustment expenses	$ 13,200,000		10,900,000
Cumulative Effect, Period of Adoption, Adjustment
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Media content			$ 3,300,000
Minimum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Renewal term	1 year
Remaining lease term	1 year
Minimum | Insurance policy renewal rights
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Intangible asset useful life	3 years	3 years
Minimum | Internally developed software
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Intangible asset useful life	3 years	3 years
Minimum | Trade Names
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Intangible asset useful life	3 years	3 years
Minimum | Noncompete Agreements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Intangible asset useful life	3 years	3 years
Minimum | Customer Relationships
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Intangible asset useful life	3 years	3 years
Maximum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Renewal term	20 years
Remaining lease term	14 years
Maximum | Insurance policy renewal rights
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Intangible asset useful life	25 years	25 years
Maximum | Internally developed software
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Intangible asset useful life	25 years	25 years
Maximum | Trade Names
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Intangible asset useful life	25 years	25 years
Maximum | Noncompete Agreements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Intangible asset useful life	25 years	25 years
Maximum | Customer Relationships
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Intangible asset useful life	25 years	25 years
Computers | Minimum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	3 years	3 years
Computers | Maximum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	7 years	7 years
Automobiles | Minimum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	3 years	3 years
Automobiles | Maximum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	7 years	7 years
Office furniture | Minimum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	3 years	3 years
Office furniture | Maximum
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	7 years	7 years
Building and Building Improvements
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Property, plant and equipment, useful life	39 years	39 years
The Hagerty Group, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
LLC ownership percent	24.50%	24.50%	24.70%
Member Hubs Holding, LLC | The Hagerty Group, LLC
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
LLC ownership percent	80.00%	80.00%