Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Feb. 17, 2021	Jun. 30, 2020
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Entity File Number	1-10670
Entity Registrant Name	HANGER, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-0904275
Entity Address, Address Line One	10910 Domain Drive, Suite 300
Entity Address, City or Town	Austin
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78758
City Area Code	512
Local Phone Number	777-3800
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	HNGR
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 376.8
Entity Common Stock, Shares Outstanding		38,147,988
Entity Central Index Key	0000722723
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
ICFR Auditor Attestation Flag	true