Net Income Per Unit - Narrative (Details) - shares		3 Months Ended		6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Asset Acquisition, Equity Interest Transfered As Consideration, Shares				5,000,000
General Partnership [Member]
General partner's ownership interest (as percent)		2.00%	2.00%	2.00%	2.00%
Big Spring Gathering Asset
Asset Acquisition, Equity Interest Transfered As Consideration, Shares	5,000,000.0