Organization and Summary of Significant Accounting Policies - Accounts Receivable, Net (Details)	12 Months Ended
Dec. 31, 2020
Organization and Summary of Significant Accounting Policies
Minimum period of receivable balances for which an evaluation of its collectability is performed	1 year
Adjudication period of receivable balances for which an evaluation of its collectability is performed	12 months

Represents the adjudication period of receivable balances for which company-wide evaluation of its collectability is performed at least semi-annually.

No definition available.

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