Employee Benefits - DB SERP (Details) - payment	1 Months Ended	12 Months Ended
Jan. 31, 2004	Dec. 31, 2019	Dec. 31, 2018
Supplemental Executive Retirement Plan (SERP)
Number of annual payments upon retirement	15
Average remaining service period		9 years 6 months	10 years 6 months

Estimated average period over which an employee is required to provide service in exchange for the unfunded non contributory defined benefit plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	hgr_DefinedBenefitPlanAverageRemainingServicePeriod
Namespace Prefix:	hgr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration