MYRTLE GROVE SHARE PURCHASE AND SUBSCRIPTION AGREEMENT - Heartland Share Purchase and Subscription Agreement (Details) $ / shares in Units, $ in Millions		3 Months Ended
	Jan. 17, 2020 USD ($) member $ / shares shares	Mar. 31, 2020	Dec. 31, 2019
Common Class A
Class of Stock [Line Items]
Capital investment, percentage	50.00%
Heartland SPV
Class of Stock [Line Items]
Ownership percentage		35.00%
Number of managers | member	5
Conversion basis ratio (in shares)	1
Annual return		22.50%
Vertex Refining OH, LLC
Class of Stock [Line Items]
Ownership percentage			100.00%
Tensile-Heartland | Preferred Class A
Class of Stock [Line Items]
Ownership percentage	100.00%
Preferred stock, dividend percentage	22.50%
Tensile-Heartland | Heartland SPV
Class of Stock [Line Items]
Ownership percentage	65.00%
Number of managers | member	3
Vertex Operating | Heartland SPV
Class of Stock [Line Items]
Ownership percentage	35.00%
Number of managers | member	2
Heartland SPV
Class of Stock [Line Items]
Purchase amount | $	$ 7.5
Percentage acquired	50.00%
Heartland SPV | Common Class A
Class of Stock [Line Items]
Redemption period	180 days
Redemption price, percentage	25.00%
Percentage of aggregate capital investment to be added to original per-unit price to determine cash purchase price	50.00%
Aggregate unpaid annual return | $	$ 21.0
Heartland SPV | Tensile-Heartland | Class A-2 Preferred Units
Class of Stock [Line Items]
Share price (in usd per share) | $ / shares	$ 1,000
Additional consideration (in shares)	7,000
Vertex Refining OH, LLC | Heartland SPV | Common Class A
Class of Stock [Line Items]
Consideration transferred (in shares)	13,500
Vertex Refining OH, LLC | Heartland SPV | A-1 Preferred Units
Class of Stock [Line Items]
Consideration transferred (in shares)	13,500
Vertex Refining OH, LLC | Heartland SPV | Common Class B
Class of Stock [Line Items]
Consideration transferred (in shares)	11,300
Vertex Splitter Corporation | Vertex Refining OH, LLC | Heartland SPV | Common Class B
Class of Stock [Line Items]
Consideration transferred (in shares)	248
Vertex Operating | MG SPV | Common Class A
Class of Stock [Line Items]
Consideration transferred (in shares)	1,000
Share price (in usd per share) | $ / shares	$ 1,000
Equity interest issued or issuable | $	$ 1.0
Vertex Operating | Heartland SPV | Tensile-Heartland | Common Class A
Class of Stock [Line Items]
Consideration transferred (in shares)	13,500
Total purchase price | $	$ 13.5
Vertex Operating | Heartland SPV | Tensile-Heartland | A-1 Preferred Units
Class of Stock [Line Items]
Consideration transferred (in shares)	13,500
Heartland SPV | Heartland SPV | Tensile-Heartland | Common Class A
Class of Stock [Line Items]
Consideration transferred (in shares)	7,500
Total purchase price | $	$ 7.5
Heartland SPV | Heartland SPV | Tensile-Heartland | A-1 Preferred Units
Class of Stock [Line Items]
Consideration transferred (in shares)	7,500
MG SPV | Tensile-MG
Class of Stock [Line Items]
Ownership interest	15.00%
MG SPV | Vertex Operating
Class of Stock [Line Items]
Ownership interest	85.00%