Supplemental Guarantor / Non-Guarantor Financial Information Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 228,217	$ 217,412
Cash flows from investing activities
Additions to properties and equipment	(23,828)	(34,270)
Business and asset acquisitions		(6,841)
Distributions from UNEV in excess of earnings	0	0
Proceeds from sale of assets	265	210
Distributions in excess of equity in earnings of equity investments	693	1,368
Net cash provided by (used for) investing activities	(22,870)	(39,533)
Cash flows from financing activities
Net borrowings (repayments) under credit agreement	12,500	(91,000)
Net intercompany financing activities	0	0
Proceeds from Issuance of common units	0	114,887
Distributions to HEP unitholders	(204,701)	(197,300)
Distributions to noncontrolling interests	(7,750)	(5,500)
Contributions from general partner	182	614
Units withheld for tax withholding obligations	(119)	(58)
Purchase of units for incentive grants	(255)	0
Payments on finance leases	(780)	(929)
Other	0	6
Other financing activities		923
Net cash provided by (used by) financing activities	(200,923)	(179,280)
Increase (decrease) for the period	4,424	(1,401)
Beginning of period	3,045	7,776
End of period	7,469	6,375
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(62,229)	(58,326)
Cash flows from investing activities
Additions to properties and equipment	0	0
Business and asset acquisitions	0	0
Distributions from UNEV in excess of earnings	0	0
Proceeds from sale of assets	0	0
Distributions in excess of equity in earnings of equity investments	0	0
Net cash provided by (used for) investing activities	0	0
Cash flows from financing activities
Net borrowings (repayments) under credit agreement	12,500	(91,000)
Net intercompany financing activities	260,362	231,231
Proceeds from Issuance of common units		114,839
Distributions to HEP unitholders	(204,701)	(197,300)
Distributions to noncontrolling interests	0	0
Contributions from general partner	182	614
Units withheld for tax withholding obligations	(119)	(58)
Purchase of units for incentive grants	(255)
Payments on finance leases	0
Other	139
Other financing activities		0
Net cash provided by (used by) financing activities	67,830	58,326
Increase (decrease) for the period	5,601	0
Beginning of period	2	2
End of period	5,603	2
Guarantor Restricted Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	271,657	259,360
Cash flows from investing activities
Additions to properties and equipment	(23,227)	(28,057)
Business and asset acquisitions		(6,803)
Distributions from UNEV in excess of earnings	10,572	(7,156)
Proceeds from sale of assets	265	(210)
Distributions in excess of equity in earnings of equity investments	693	1,368
Net cash provided by (used for) investing activities	(11,697)	(26,126)
Cash flows from financing activities
Net borrowings (repayments) under credit agreement	0	0
Net intercompany financing activities	(260,362)	(231,231)
Proceeds from Issuance of common units		48
Distributions to HEP unitholders	0	0
Distributions to noncontrolling interests	0	0
Contributions from general partner	0	0
Units withheld for tax withholding obligations	0	0
Purchase of units for incentive grants	0
Payments on finance leases	(780)
Other	(139)
Other financing activities		923
Net cash provided by (used by) financing activities	(261,003)	(232,106)
Increase (decrease) for the period	(1,043)	1,128
Beginning of period	0	511
End of period	(1,043)	1,639
Non-Guarantor Non-Restricted Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	31,467	25,722
Cash flows from investing activities
Additions to properties and equipment	(601)	(6,213)
Business and asset acquisitions		38
Distributions from UNEV in excess of earnings	0	0
Proceeds from sale of assets	0	0
Distributions in excess of equity in earnings of equity investments	0	0
Net cash provided by (used for) investing activities	(601)	(6,251)
Cash flows from financing activities
Net borrowings (repayments) under credit agreement	0	0
Net intercompany financing activities	0	0
Proceeds from Issuance of common units		0
Distributions to HEP unitholders	0	0
Distributions to noncontrolling interests	(31,000)	(22,000)
Contributions from general partner	0	0
Units withheld for tax withholding obligations	0	0
Purchase of units for incentive grants	0
Payments on finance leases	0
Other	0
Other financing activities		0
Net cash provided by (used by) financing activities	(31,000)	(22,000)
Increase (decrease) for the period	(134)	(2,529)
Beginning of period	3,043	7,263
End of period	2,909	4,734
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(12,678)	(9,344)
Cash flows from investing activities
Additions to properties and equipment	0	0
Business and asset acquisitions		0
Distributions from UNEV in excess of earnings	(10,572)	7,156
Proceeds from sale of assets	0	0
Distributions in excess of equity in earnings of equity investments	0	0
Net cash provided by (used for) investing activities	(10,572)	(7,156)
Cash flows from financing activities
Net borrowings (repayments) under credit agreement	0	0
Net intercompany financing activities	0	0
Proceeds from Issuance of common units		0
Distributions to HEP unitholders	0	0
Distributions to noncontrolling interests	23,250	16,500
Contributions from general partner	0	0
Units withheld for tax withholding obligations	0	0
Purchase of units for incentive grants	0
Payments on finance leases	0
Other	0
Other financing activities		0
Net cash provided by (used by) financing activities	23,250	16,500
Increase (decrease) for the period	0	0
Beginning of period	0	0
End of period	$ 0	$ 0