SIGNIFICANT ACCOUNTING POLICIES - Self-Insurance Reserves (Details) $ in Millions	Dec. 31, 2017 USD ($)
SIGNIFICANT ACCOUNTING POLICIES
Maximum amount of stop-loss coverage on claims	$ 0.4
Maximum amount of liability claims for workers' compensation, product, professional and general per individual incident	$ 0.5

The maximum amount of we are responsible for workers' compensation, product, professional and general liability claims under the self-insurance reserves per individual incident.

No definition available.

Name:	hgr_LiabilityForClaimsEmployeesCompensationProductProfessionalAndGeneralLiabilityClaimsMaximumAmountPerIndividualIncident
Namespace Prefix:	hgr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant