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CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 2 - Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Condensed Financial Statements, Captions [Line Items]        
Revenues $ 486,204 $ 435,488 $ 962,085 $ 922,918
Costs and expenses 406,366 362,084 783,767 752,375
Operating (loss) income 79,838 73,404 178,318 170,543
Equity in earnings (loss) of subsidiaries 0 0 0 0
Interest income (expense), net (48,936) (45,612) (96,708) (82,026)
Other income (expense), net 1,412 88 81,164 228
Income before income tax expense 32,314 27,880 162,774 88,745
Income tax expense (benefit) 2,915 1,630 7,242 4,555
Net income (loss) 29,399 26,250 155,532 84,190
Comprehensive income (loss) 26,778 27,381 173,835 89,084
Eliminations [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues (147) (347) (349) (634)
Costs and expenses (147) (347) (349) (634)
Operating (loss) income 0 0 0 0
Equity in earnings (loss) of subsidiaries (100,410) (76,442) (468,516) (209,565)
Interest income (expense), net 0 0 0 0
Other income (expense), net 0 0 0 0
Income before income tax expense (100,410) (76,442) (468,516) (209,565)
Income tax expense (benefit) 0 0 0 0
Net income (loss) (100,410) (76,442) (468,516) (209,565)
Comprehensive income (loss) (100,410) (76,442) (468,516) (209,565)
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues 0 0 0 0
Costs and expenses 538 486 1,150 995
Operating (loss) income (538) (486) (1,150) (995)
Equity in earnings (loss) of subsidiaries 29,900 26,732 156,613 85,177
Interest income (expense), net 37 4 69 8
Other income (expense), net 0 0 0 0
Income before income tax expense 29,399 26,250 155,532 84,190
Income tax expense (benefit) 0 0 0 0
Net income (loss) 29,399 26,250 155,532 84,190
Comprehensive income (loss) 29,399 26,250 155,532 84,190
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues 117,862 128,895 237,556 252,524
Costs and expenses 86,588 83,096 159,004 159,418
Operating (loss) income 31,274 45,799 78,552 93,106
Equity in earnings (loss) of subsidiaries 1,692 (7,177) (557) (6,067)
Interest income (expense), net (50,357) (46,390) (100,383) (83,304)
Other income (expense), net 1,848 62 2,324 83
Income before income tax expense (15,543) (7,706) (20,064) 3,818
Income tax expense (benefit) 61 (365) 231 (34)
Net income (loss) (15,604) (7,341) (20,295) 3,852
Comprehensive income (loss) (9,336) (13,592) 4,784 (561)
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues 66,505 50,577 122,779 102,818
Costs and expenses 42,324 37,781 77,505 67,587
Operating (loss) income 24,181 12,796 45,274 35,231
Equity in earnings (loss) of subsidiaries 23,145 22,746 135,148 48,961
Interest income (expense), net (1,724) (1,401) (3,295) (2,705)
Other income (expense), net 73 3 188 9
Income before income tax expense 45,675 34,144 177,315 81,496
Income tax expense (benefit) 0 1 1 2
Net income (loss) 45,675 34,143 177,314 81,494
Comprehensive income (loss) 45,675 34,143 177,314 81,494
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues 301,984 256,363 602,099 568,210
Costs and expenses 277,063 241,068 546,457 525,009
Operating (loss) income 24,921 15,295 55,642 43,201
Equity in earnings (loss) of subsidiaries 45,673 34,141 177,312 81,494
Interest income (expense), net 3,108 2,175 6,901 3,975
Other income (expense), net (509) 23 78,652 136
Income before income tax expense 73,193 51,634 318,507 128,806
Income tax expense (benefit) 2,854 1,994 7,010 4,587
Net income (loss) 70,339 49,640 311,497 124,219
Comprehensive income (loss) $ 61,450 $ 57,022 $ 304,721 $ 133,526