Consolidated Statements of Changes in Unitholders' Equity - USD ($) shares in Thousands, $ in Thousands		Total	General Partner	Limited Partners Member's Equity Limited Partners	Common Units Limited Partners	Class B Units Limited Partners	Non-Controlling Interest	Accumulated Other Comprehensive Income	Non-Controlling Interest-Accumulated Other Comprehensive Income
Beginning balance at Dec. 31, 2016	[1]	$ 92,729	$ 0	$ 92,729	$ 0	$ 0	$ 0
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from Diamondback		58,742		58,742
Net income		2,938		2,938
Ending balance at Mar. 31, 2017	[1]	154,409	0	154,409	$ 0	$ 0	0
Ending balance (in shares) at Mar. 31, 2017	[1]				0	0
Beginning balance at Dec. 31, 2016	[1]	92,729	0	92,729	$ 0	$ 0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income	[1]	0
Net income	[1]	20,665
Ending balance at Dec. 31, 2017	[1]	292,608	0	292,608	$ 0	$ 0	0
Ending balance (in shares) at Dec. 31, 2017	[1]				0	0
Beginning balance at Mar. 31, 2017	[1]	154,409	0	154,409	$ 0	$ 0	0
Beginning balance (in shares) at Mar. 31, 2017	[1]				0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from Diamondback		(3,679)		(3,679)
Net income		5,146		5,146
Ending balance at Jun. 30, 2017	[1]	155,876	0	155,876	$ 0	$ 0	0
Ending balance (in shares) at Jun. 30, 2017	[1]				0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from Diamondback		70,116		70,116
Net income		3,185		3,185
Ending balance at Sep. 30, 2017	[1]	229,177	0	229,177	$ 0	$ 0	0
Ending balance (in shares) at Sep. 30, 2017	[1]				0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from Diamondback		54,035		54,035
Net income		9,396		9,396
Ending balance at Dec. 31, 2017	[1]	292,608	0	292,608	$ 0	$ 0	0
Ending balance (in shares) at Dec. 31, 2017	[1]				0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from Diamondback		175,100		175,100
Net income		14,396		14,396
Ending balance at Mar. 31, 2018	[1]	482,104	0	482,104	$ 0	$ 0	0
Ending balance (in shares) at Mar. 31, 2018	[1]				0	0
Beginning balance at Dec. 31, 2017	[1]	292,608	0	292,608	$ 0	$ 0	0
Beginning balance (in shares) at Dec. 31, 2017	[1]				0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income	[1]	0
Net income	[1]	62,960
Ending balance at Dec. 31, 2018	[1]	527,126	0	527,125	$ 0	$ 1	0
Ending balance (in shares) at Dec. 31, 2018	[1]				0	0
Beginning balance at Mar. 31, 2018	[1]	482,104	0	482,104	$ 0	$ 0	0
Beginning balance (in shares) at Mar. 31, 2018	[1]				0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from Diamondback		3,417		3,417
Net income		15,472		15,472
Ending balance at Jun. 30, 2018	[1]	500,993	0	500,993	$ 0	$ 0	0
Ending balance (in shares) at Jun. 30, 2018	[1]				0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from Diamondback		(1,982)		(1,982)
Net income		17,780		17,780
Ending balance at Sep. 30, 2018	[1]	516,791	0	516,791	$ 0	$ 0	0
Ending balance (in shares) at Sep. 30, 2018	[1]				0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from Diamondback		(4,977)		(4,978)		$ 1
Net income		15,312		15,312
Ending balance at Dec. 31, 2018	[1]	527,126	0	527,125	$ 0	$ 1	0
Ending balance (in shares) at Dec. 31, 2018	[1]				0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Contributions from Diamondback		458,674		458,674
Net income		39,356		39,356
Ending balance at Mar. 31, 2019		1,025,156	0	1,025,155	$ 0	$ 1	0
Ending balance (in shares) at Mar. 31, 2019					0	0
Beginning balance at Dec. 31, 2018	[1]	527,126	0	527,125	$ 0	$ 1	0
Beginning balance (in shares) at Dec. 31, 2018	[1]				0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income		(823)
Net income		185,719
Ending balance at Dec. 31, 2019		1,115,840	979		$ 737,777	$ 979	376,928	$ (198)	$ (625)
Ending balance (in shares) at Dec. 31, 2019					43,700	107,815
Beginning balance at Mar. 31, 2019		1,025,156	0	1,025,155	$ 0	$ 1	0
Beginning balance (in shares) at Mar. 31, 2019					0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		46,679
Ending balance at Jun. 30, 2019		1,065,161	1,000	0	$ 725,261	$ 1,000	337,900	0	0
Ending balance (in shares) at Jun. 30, 2019					43,700	107,815
Beginning balance at May. 28, 2019		1,018,083	0	1,018,082	$ 0	$ 1	0
Beginning balance (in shares) at May. 28, 2019					0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Distributions to Diamondback		(726,513)		(726,513)
Net proceeds from the offering - public (in shares)					43,700
Net proceeds from the offering - public		719,627			$ 719,627
Net proceeds from the offering - General Partner		1,000	1,000
Net proceeds from the offering - Diamondback (in shares)						107,815
Net proceeds from the offering - Diamondback		999				$ 999
Unit-based compensation, net of distribution equivalent right payments		831			831
Elimination of current and deferred tax liabilities		31,094		31,094
Allocation of net investment to unitholder		0		(322,663)			322,663
Net income		20,040			4,803		15,237
Ending balance at Jun. 30, 2019		1,065,161	1,000	0	$ 725,261	$ 1,000	337,900	0	0
Ending balance (in shares) at Jun. 30, 2019					43,700	107,815
Beginning balance at May. 28, 2019		1,018,083	0	1,018,082	$ 0	$ 1	0
Beginning balance (in shares) at May. 28, 2019					0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		119,724
Ending balance at Dec. 31, 2019		1,115,840	979		$ 737,777	$ 979	376,928	(198)	(625)
Ending balance (in shares) at Dec. 31, 2019					43,700	107,815
Beginning balance at Jun. 30, 2019		1,065,161	1,000	$ 0	$ 725,261	$ 1,000	337,900	0	0
Beginning balance (in shares) at Jun. 30, 2019					43,700	107,815
Increase (Decrease) in Partners' Capital [Roll Forward]
Net proceeds from the offering - public		(251)			$ (251)
Unit-based compensation, net of distribution equivalent right payments		2,158			2,158
Net income		48,080			11,531		36,549
Ending balance at Sep. 30, 2019		1,115,148	1,000		$ 738,699	$ 1,000	374,449	0	0
Ending balance (in shares) at Sep. 30, 2019					43,700	107,815
Increase (Decrease) in Partners' Capital [Roll Forward]
Distributions to public		(14,858)			$ (14,858)
Distributions to Diamondback		(21)				$ (21)
Unit-based compensation, net of distribution equivalent right payments		1,468			1,468
Distributions to General Partner		(21)	(21)
Distributions to non-controlling interest		(36,657)					(36,657)
Other comprehensive income		(823)						(198)	(625)
Net income		51,604			12,468		39,136
Ending balance at Dec. 31, 2019		$ 1,115,840	$ 979		$ 737,777	$ 979	$ 376,928	$ (198)	$ (625)
Ending balance (in shares) at Dec. 31, 2019					43,700	107,815

[1] See Note 1 for information regarding the basis of financial statement presentation.