Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 Railcar mi Segment	Sep. 30, 2019	Jan. 25, 2018	Jan. 24, 2018
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Number of crude oil rail cars	550
McKenzie County
Segment Reporting Information [Line Items]
Crude oil pipeline length | mi	6
Minimum
Segment Reporting Information [Line Items]
Number of crude oil rail cars, operate as unit trains	100
Maximum
Segment Reporting Information [Line Items]
Number of crude oil rail cars, operate as unit trains	110
LM4
Segment Reporting Information [Line Items]
Percentage of ownership in joint venture		50.00%	50.00%	50.00%