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CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 2 - Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]    
Revenues $ 475,881 $ 487,430
Costs and expenses 377,401 390,291
Operating (loss) income 98,480 97,139
Equity in earnings (loss) of subsidiaries 0 0
Interest income (expense), net (47,772) (36,414)
Other income (expense), net 79,752 140
Income before income tax expense 130,460 60,865
Income tax expense (benefit) 4,327 2,925
Net income (loss) 126,133 57,940
Comprehensive income (loss) 147,057 61,703
Eliminations [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues (202) (287)
Costs and expenses (202) (287)
Operating (loss) income 0 0
Equity in earnings (loss) of subsidiaries (368,106) (133,123)
Interest income (expense), net 0 0
Other income (expense), net 0 0
Income before income tax expense (368,106) (133,123)
Income tax expense (benefit) 0 0
Net income (loss) (368,106) (133,123)
Comprehensive income (loss) (368,106) (133,123)
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 0 0
Costs and expenses 612 509
Operating (loss) income (612) (509)
Equity in earnings (loss) of subsidiaries 126,713 58,445
Interest income (expense), net 32 4
Other income (expense), net 0 0
Income before income tax expense 126,133 57,940
Income tax expense (benefit) 0 0
Net income (loss) 126,133 57,940
Comprehensive income (loss) 126,133 57,940
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 119,694 123,629
Costs and expenses 72,416 76,322
Operating (loss) income 47,278 47,307
Equity in earnings (loss) of subsidiaries (2,249) 1,110
Interest income (expense), net (50,026) (36,914)
Other income (expense), net 476 21
Income before income tax expense (4,521) 11,524
Income tax expense (benefit) 170 331
Net income (loss) (4,691) 11,193
Comprehensive income (loss) 14,120 13,031
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 56,274 52,241
Costs and expenses 35,181 29,806
Operating (loss) income 21,093 22,435
Equity in earnings (loss) of subsidiaries 112,003 26,215
Interest income (expense), net (1,571) (1,304)
Other income (expense), net 115 6
Income before income tax expense 131,640 47,352
Income tax expense (benefit) 1 1
Net income (loss) 131,639 47,351
Comprehensive income (loss) 131,639 47,351
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 300,115 311,847
Costs and expenses 269,394 283,941
Operating (loss) income 30,721 27,906
Equity in earnings (loss) of subsidiaries 131,639 47,353
Interest income (expense), net 3,793 1,800
Other income (expense), net 79,161 113
Income before income tax expense 245,314 77,172
Income tax expense (benefit) 4,156 2,593
Net income (loss) 241,158 74,579
Comprehensive income (loss) $ 243,271 $ 76,504