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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, 2020
Mar. 31, 2019
Condensed Financial Statements, Captions [Line Items]    
Revenues $ 392,791 $ 347,826
Costs and expenses 485,850 274,221
Operating income (loss) (93,059) 73,605
Equity in earnings (loss) of subsidiaries 0 0
Interest income (expense), net (47,494) (44,291)
Other income (expense), net (6,489) 791
Income (loss) before income tax expense (147,042)  
Income (loss) from continuing operations before income tax expense (147,042) 30,105
Income tax expense (benefit) 599 1,182
Income (loss) from continuing operations (147,641) 28,923
Loss from discontinued operations, net of tax 0 (306,786)
Net income (loss) (147,641) (277,863)
Comprehensive income (loss) (183,954) (282,689)
Eliminations [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues (136) (187)
Costs and expenses (136) (187)
Operating income (loss) 0 0
Equity in earnings (loss) of subsidiaries 206,837 (76,853)
Interest income (expense), net 0 0
Other income (expense), net 0 0
Income (loss) before income tax expense 206,837  
Income (loss) from continuing operations before income tax expense   (76,853)
Income tax expense (benefit) 0 0
Income (loss) from continuing operations   (76,853)
Loss from discontinued operations, net of tax   920,358
Net income (loss) 206,837 843,505
Comprehensive income (loss) 206,837 843,505
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 0 0
Costs and expenses 728 676
Operating income (loss) (728) (676)
Equity in earnings (loss) of subsidiaries (146,988) 29,491
Interest income (expense), net 75 108
Other income (expense), net 0 0
Income (loss) before income tax expense (147,641)  
Income (loss) from continuing operations before income tax expense   28,923
Income tax expense (benefit) 0 0
Income (loss) from continuing operations   28,923
Loss from discontinued operations, net of tax   (306,786)
Net income (loss) (147,641) (277,863)
Comprehensive income (loss) (147,641) (277,863)
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 161,302 117,555
Costs and expenses 184,171 77,411
Operating income (loss) (22,869) 40,144
Equity in earnings (loss) of subsidiaries (118,215) 1,339
Interest income (expense), net (48,070) (45,456)
Other income (expense), net 859 754
Income (loss) before income tax expense (188,295)  
Income (loss) from continuing operations before income tax expense   (3,219)
Income tax expense (benefit) 129 117
Income (loss) from continuing operations   (3,336)
Loss from discontinued operations, net of tax   0
Net income (loss) (188,424) (3,336)
Comprehensive income (loss) (217,607) (9,066)
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 62,664 58,353
Costs and expenses 37,779 36,050
Operating income (loss) 24,885 22,303
Equity in earnings (loss) of subsidiaries 16,787 12,738
Interest income (expense), net (319) (1,933)
Other income (expense), net 247 177
Income (loss) before income tax expense 41,600  
Income (loss) from continuing operations before income tax expense   33,285
Income tax expense (benefit) 0 0
Income (loss) from continuing operations   33,285
Loss from discontinued operations, net of tax   (306,786)
Net income (loss) 41,600 (273,501)
Comprehensive income (loss) 41,600 (273,501)
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Condensed Financial Statements, Captions [Line Items]    
Revenues 168,961 172,105
Costs and expenses 263,308 160,271
Operating income (loss) (94,347) 11,834
Equity in earnings (loss) of subsidiaries 41,579 33,285
Interest income (expense), net 820 2,990
Other income (expense), net (7,595) (140)
Income (loss) before income tax expense (59,543)  
Income (loss) from continuing operations before income tax expense   47,969
Income tax expense (benefit) 470 1,065
Income (loss) from continuing operations   46,904
Loss from discontinued operations, net of tax   (613,572)
Net income (loss) (60,013) (566,668)
Comprehensive income (loss) $ (67,143) $ (565,764)