Condensed Consolidated Statements of Changes to Unitholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Limited Partner	General Partner	Non-Controlling Interest	Common Units Limited Partner	Class B Units Limited Partner
Beginning balance at Dec. 31, 2018	$ 1,237,042		$ 1,000	$ 694,940	$ 540,112	$ 990
Beginning balance (in shares) at Dec. 31, 2018					51,654	72,419
Increase (Decrease) in Partners' Capital [Roll Forward]
Net proceeds from the issuance of common units - public (units)					10,925
Net proceeds from the issuance of common units - public	340,648				$ 340,648
Unit-based compensation (units)					60
Unit-based compensation	405				$ 405
Distributions to public	(25,970)				(25,970)
Distributions to Diamondback	(37,326)			(36,934)	(392)
Distributions to General Partner	(20)				(20)
Change in ownership of consolidated subsidiaries, net	18,925			90,120	$ (71,195)
Units repurchased for tax withholding (units)					(11)
Units repurchased for tax withholding	(353)				$ (353)
Net income (loss)	74,311			40,532	$ 33,779
Ending balance (in shares) at Mar. 31, 2019					62,628	72,419
Ending balance at Mar. 31, 2019	1,607,662		1,000	788,658	$ 817,014	$ 990
Beginning balance at Dec. 31, 2018	1,237,042		1,000	694,940	$ 540,112	$ 990
Beginning balance (in shares) at Dec. 31, 2018					51,654	72,419
Increase (Decrease) in Partners' Capital [Roll Forward]
Change in ownership of consolidated subsidiaries, net		$ 71,195
Net income (loss)	172,682
Ending balance (in shares) at Sep. 30, 2019					62,649	72,419
Ending balance at Sep. 30, 2019	1,592,068		1,000	815,263	$ 774,815	$ 990
Beginning balance at Mar. 31, 2019	1,607,662		1,000	788,658	$ 817,014	$ 990
Beginning balance (in shares) at Mar. 31, 2019					62,628	72,419
Increase (Decrease) in Partners' Capital [Roll Forward]
Offering costs	(9)				$ (9)
Unit-based compensation (units)					0
Unit-based compensation	472				$ 472
Distributions to public	(23,521)				(23,521)
Distributions to Diamondback	(27,817)			(27,519)	(298)
Distributions to General Partner	(20)				(20)
Net income (loss)	47,274			45,009	$ 2,265
Ending balance (in shares) at Jun. 30, 2019					62,628	72,419
Ending balance at Jun. 30, 2019	1,604,041		1,000	806,148	$ 795,903	$ 990
Increase (Decrease) in Partners' Capital [Roll Forward]
Unit-based compensation (units)					21
Unit-based compensation	449				$ 449
Distributions to public	(29,099)				(29,099)
Distributions to Diamondback	(34,400)			(34,036)	(364)
Distributions to General Partner	(20)				(20)
Change in ownership of consolidated subsidiaries, net		0
Net income (loss)	51,097			43,151	$ 7,946
Ending balance (in shares) at Sep. 30, 2019					62,649	72,419
Ending balance at Sep. 30, 2019	1,592,068		1,000	815,263	$ 774,815	$ 990
Beginning balance at Dec. 31, 2019	2,185,420		889	1,254,285	$ 929,116	$ 1,130
Beginning balance (in shares) at Dec. 31, 2019					67,806	90,710
Increase (Decrease) in Partners' Capital [Roll Forward]
Unit-based compensation (units)					42
Unit-based compensation	387				$ 387
Distribution equivalent rights payments	(20)				(20)
Distributions to public	(30,194)				(30,194)
Distributions to Diamondback	(41,173)			(40,819)	$ (329)	$ (25)
Distributions to General Partner	(20)		(20)
Units repurchased for tax withholding (units)					(17)
Units repurchased for tax withholding	(383)				$ (383)
Net income (loss)	(123,850)			18,319	$ (142,169)
Ending balance (in shares) at Mar. 31, 2020					67,831	90,710
Ending balance at Mar. 31, 2020	1,990,167		869	1,231,785	$ 756,408	$ 1,105
Beginning balance at Dec. 31, 2019	2,185,420		889	1,254,285	$ 929,116	$ 1,130
Beginning balance (in shares) at Dec. 31, 2019					67,806	90,710
Increase (Decrease) in Partners' Capital [Roll Forward]
Change in ownership of consolidated subsidiaries, net		0
Net income (loss)	(140,722)
Ending balance (in shares) at Sep. 30, 2020					67,851	90,710
Ending balance at Sep. 30, 2020	1,953,144		829	1,225,635	$ 725,625	$ 1,055
Beginning balance at Mar. 31, 2020	1,990,167		869	1,231,785	$ 756,408	$ 1,105
Beginning balance (in shares) at Mar. 31, 2020					67,831	90,710
Increase (Decrease) in Partners' Capital [Roll Forward]
Unit-based compensation (units)					0
Unit-based compensation	283				$ 283
Distribution equivalent rights payments	(4)				(4)
Distributions to public	(6,710)				(6,710)
Distributions to Diamondback	(9,175)			(9,074)	(76)	$ (25)
Distributions to General Partner	(20)		(20)
Net income (loss)	(33,056)			(11,304)	$ (21,752)
Ending balance (in shares) at Jun. 30, 2020					67,831	90,710
Ending balance at Jun. 30, 2020	1,941,485		849	1,211,407	$ 728,149	$ 1,080
Increase (Decrease) in Partners' Capital [Roll Forward]
Unit-based compensation (units)					20
Unit-based compensation	275				$ 275
Distribution equivalent rights payments	(2)				(2)
Distributions to public	(2,013)				(2,013)
Distributions to Diamondback	(2,764)			(2,720)	(19)	$ (25)
Distributions to General Partner	(20)		(20)
Change in ownership of consolidated subsidiaries, net		$ 0
Units repurchased for tax withholding	(1)				(1)
Net income (loss)	16,184			16,948	$ (764)
Ending balance (in shares) at Sep. 30, 2020					67,851	90,710
Ending balance at Sep. 30, 2020	$ 1,953,144		$ 829	$ 1,225,635	$ 725,625	$ 1,055