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Basis of Presentation and Accounting Policies - Narrative (Details) - segment
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Number of operating segments 1  
Number of reportable segments 1  
The Hagerty Group, LLC    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Ownership percentage by Hagerty, Inc 26.10% 24.90%