Represents the number of shares of Preferred Stock each right entitles a holder to purchase.

No definition available.

Name:	hgr_ClassOfWarrantOrRightShareOfPreferredStockPerRight
Namespace Prefix:	hgr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum threshold of common stock ownership change for purchase rights to be exercisable.

+ References

No definition available.

+ Details

Name:	hgr_CommonStockOwnershipPercentageRightsExercisableMinimumThreshold
Namespace Prefix:	hgr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Dividend for common stock in the form of preferred shared purchase right.

+ References

No definition available.

+ Details

Name:	hgr_DividendsCommonStockPreferredSharePurchaseRight
Namespace Prefix:	hgr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_PreferredStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesAPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_PreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=hgr_PreferredStockPurchaseRightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Shareholders' Equity (Deficit) (Details) - $ / shares	Feb. 28, 2016	Dec. 31, 2019	Dec. 31, 2018
Shareholder's Rights Plan
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Series A Junior Participating Preferred Stock
Shareholder's Rights Plan
Number of shares of Preferred Stock each Right entitles a holder to purchase	0.001
Purchase price per right	$ 65.00
Common Stock
Shareholder's Rights Plan
Common stock, par value (in dollars per share)	$ 0.01
Minimum threshold percentage of common stock for rights exercisable	10.00%
Preferred Stock \| Series A Junior Participating Preferred Stock
Shareholder's Rights Plan
Preferred stock, par value (in dollars per share)	$ 0.01
Right
Shareholder's Rights Plan
Preferred share purchase right	1