Divestitures	12 Months Ended
Divestitures	Dec. 31, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Divestitures	12 — Divestitures In 2023, management began a review of certain components of the Company's operations which resulted in the sale or reorganization of certain businesses, including Hagerty Garage + Social, DriveShare, and Motorsport Reg ("MSR"), as discussed below. This initiative supports the Company's strategy to prioritize investments and resources in the areas of its business that offer the strongest growth and profit potential. Hagerty Garage + Social In the third quarter of 2023, Hagerty Ventures LLC ("HV"), a wholly owned subsidiary of THG, entered into an agreement with HGS Hub Holdings LLC ("H3") to terminate the joint venture agreement governing Member Hubs Holding, LLC ("MHH"), which operates as Hagerty Garage + Social. In connection with this agreement, H3's approximately 20% equity interest in MHH was redeemed and MHH's equity interests in the Palm Beach, Florida and Redmond, Washington locations of Hagerty Garage + Social were distributed to H3. Following the termination of the joint venture agreement, HV owns 100% of MHH and its remaining Hagerty Garage + Social locations in Delray Beach, Florida; Miami, Florida; Van Nuys, California; and Burlington, Ontario. As a result of the joint venture termination, the Company recognized a loss of $2.9 million in the third quarter of 2023, representing the difference between the fair value of the approximately 20% equity interest in MHH received by HV and the carrying value of the equity interests distributed to H3. The fair value of the approximately 20% equity interest received by MHH is a Level 3 fair value measurement and was determined using a combination of a discounted cash flow model and the adjusted book value method. This loss is recorded within "Gains, losses, and impairments related to divestitures" in the Consolidated Statements of Operations. Immediately prior to the joint venture termination, MHH entered into an agreement to terminate the real estate lease held by the Culver City, California location of Hagerty Garage + Social. In connection with this lease termination agreement, MHH paid a termination fee funded by the Company and H3 in exchange for the extinguishment of its remaining obligations under the lease. As a result of this lease termination, the Company recognized a loss of $0.6 million in the third quarter of 2023, consisting of the lease termination fee paid to the landlord, partially offset by the net effect of the derecognition of the assets and liabilities related to the lease. This loss is reported within "Gains, losses, and impairments related to divestitures" in the Consolidated Statements of Operations. Following this lease termination, MHH no longer operates a Hagerty Garage + Social location in Culver City, California. Hagerty DriveShare In the third quarter of 2023, THG entered into an agreement to sell Hagerty DriveShare, LLC ("DriveShare"), a peer-to-peer rental platform for collector vehicles, to a third party. The sale was completed on October 9, 2023. The Company recognized a $0.4 million loss related to this sale in the third quarter of 2023, which was recorded within "Gains, losses, and impairments related to divestitures" in the Consolidated Statements of Operations. Motorsport Reg In the second quarter of 2024, THG sold substantially all of the assets and liabilities of MSR, a motorsport membership, licensing and event online management system, to a third party. The material elements of the sale consideration include a fixed purchase price and a contingent payment opportunity, based on future performance. The Company recognized a $0.1 million gain related to the sale of MSR, which was recorded within "Gains, losses, and impairments related to divestitures" in the Consolidated Statements of Operations.