Supplemental Executive Retirement Plans - DC SERP (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Retirement Benefits [Abstract]
Estimated accumulated benefit obligation	$ 4.7	$ 4.8
Funded estimated accumulated benefit obligation	4.5	4.1
Unfunded estimated accumulated benefit obligation	$ 0.2	$ 0.6

The amount of unfunded estimated accumulated obligation benefit under the defined contribution plan.

No definition available.

Name:	hngr_DefinedContributionPlanEstimatedAccumulatedObligationBenefitUnfunded
Namespace Prefix:	hngr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant