CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME
Unrealized (loss) gain on SERP, tax (benefit) provision	$ (151)	$ (16)	$ 81

Provision amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

No definition available.

Name:	hgr_OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossArisingDuringPeriodTaxProvision
Namespace Prefix:	hgr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration