Cover - shares	3 Months Ended
	Mar. 31, 2021	May 05, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--12-31
Entity File Number	001-06479
Entity Registrant Name	OVERSEAS SHIPHOLDING GROUP, INC
Entity Central Index Key	0000075208
Entity Tax Identification Number	13-2637623
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	302 Knights Run Avenue
Entity Address, City or Town	Tampa
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33602
City Area Code	(813)
Local Phone Number	209-0600
Title of 12(b) Security	Class A Common Stock (par value $0.01 per share)
Trading Symbol	OSG
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Bankruptcy Proceedings, Reporting Current	true
Entity Common Stock, Shares Outstanding		86,863,651