Notes Receivable - Schedule of Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Receivables [Abstract]
Secured loans	$ 142,956	$ 103,338
Estimate of collateral value	$ 262,543	$ 199,628
Aggregate LTV ratio	54.50%	51.80%

Loans and Leases Receivable, Collateral For Secured Borrowings1

No definition available.

Name:	hgty_LoansAndLeasesReceivableCollateralForSecuredBorrowings1
Namespace Prefix:	hgty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant