v3.19.2
Cover Document
Aug. 14, 2019
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Aug. 14, 2019
Entity Registrant Name NuStar Energy L.P.
Entity Incorporation, State or Country Code DE
Entity File Number 001-16417
Entity Tax Identification Number 74-2956831
Entity Address, Address Line One 19003 IH-10 West
Entity Address, City or Town San Antonio
Entity Address, State or Province TX
Entity Address, Postal Zip Code 78257
City Area Code (210)
Local Phone Number 918-2000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001110805
Amendment Flag false
Common Limited Partner [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common units
Trading Symbol NS
Security Exchange Name NYSE
Series A Preferred Limited Partner [Member]  
Document Information [Line Items]  
Title of 12(b) Security Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol NSprA
Security Exchange Name NYSE
Series B Preferred Limited Partner [Member]  
Document Information [Line Items]  
Title of 12(b) Security Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol NSprB
Security Exchange Name NYSE
Series C Preferred Limited Partner [Member]  
Document Information [Line Items]  
Title of 12(b) Security Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Trading Symbol NSprC
Security Exchange Name NYSE