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CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 2 - Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items]        
Revenues $ 490,363 $ 440,566 $ 1,452,448 $ 1,363,484
Costs and expenses 395,086 348,849 1,178,853 1,101,224
Operating (loss) income 95,277 91,717 273,595 262,260
Equity in earnings (loss) of subsidiaries 0 0 0 0
Interest income (expense), net (44,825) (45,256) (141,533) (127,282)
Other income (expense), net 920 (5,126) 82,084 (4,898)
Income before income tax expense 51,372 41,335 214,146 130,080
Income tax expense (benefit) 3,236 2,743 10,478 7,298
Net income (loss) 48,136 38,592 203,668 122,782
Comprehensive income (loss) 53,037 44,482 226,872 133,566
Eliminations [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues (106) (139) (455) (773)
Costs and expenses (106) (139) (455) (773)
Operating (loss) income 0 0 0 0
Equity in earnings (loss) of subsidiaries (106,564) (94,655) (575,080) (304,220)
Interest income (expense), net 0 0 0 0
Other income (expense), net 0 0 0 0
Income before income tax expense (106,564) (94,655) (575,080) (304,220)
Income tax expense (benefit) 0 0 0 0
Net income (loss) (106,564) (94,655) (575,080) (304,220)
Comprehensive income (loss) (106,564) (94,655) (575,080) (304,220)
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues 0 0 0 0
Costs and expenses 600 332 1,750 1,327
Operating (loss) income (600) (332) (1,750) (1,327)
Equity in earnings (loss) of subsidiaries 48,668 38,896 205,281 124,073
Interest income (expense), net 68 28 137 36
Other income (expense), net 0 0 0 0
Income before income tax expense 48,136 38,592 203,668 122,782
Income tax expense (benefit) 0 0 0 0
Net income (loss) 48,136 38,592 203,668 122,782
Comprehensive income (loss) 48,136 38,592 203,668 122,782
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues 127,165 127,980 364,721 380,504
Costs and expenses 76,932 77,668 235,936 237,086
Operating (loss) income 50,233 50,312 128,785 143,418
Equity in earnings (loss) of subsidiaries 9,405 (4,558) 8,848 (10,625)
Interest income (expense), net (45,532) (46,247) (145,915) (129,551)
Other income (expense), net 468 57 2,792 140
Income before income tax expense 14,574 (436) (5,490) 3,382
Income tax expense (benefit) 82 115 313 81
Net income (loss) 14,492 (551) (5,803) 3,301
Comprehensive income (loss) 19,751 (1,031) 24,535 (1,592)
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues 62,981 58,871 185,760 161,689
Costs and expenses 40,497 38,709 118,002 106,296
Operating (loss) income 22,484 20,162 67,758 55,393
Equity in earnings (loss) of subsidiaries 13,884 20,809 149,032 69,770
Interest income (expense), net (1,882) (1,455) (5,177) (4,160)
Other income (expense), net 119 (8) 307 1
Income before income tax expense 34,605 39,508 211,920 121,004
Income tax expense (benefit) 0 1 1 3
Net income (loss) 34,605 39,507 211,919 121,001
Comprehensive income (loss) 34,605 39,507 211,919 121,001
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Condensed Financial Statements, Captions [Line Items]        
Revenues 300,323 253,854 902,422 822,064
Costs and expenses 277,163 232,279 823,620 757,288
Operating (loss) income 23,160 21,575 78,802 64,776
Equity in earnings (loss) of subsidiaries 34,607 39,508 211,919 121,002
Interest income (expense), net 2,521 2,418 9,422 6,393
Other income (expense), net 333 (5,175) 78,985 (5,039)
Income before income tax expense 60,621 58,326 379,128 187,132
Income tax expense (benefit) 3,154 2,627 10,164 7,214
Net income (loss) 57,467 55,699 368,964 179,918
Comprehensive income (loss) $ 57,109 $ 62,069 $ 361,830 $ 195,595