RELATED PARTY TRANSACTIONS (Details)		5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 30, 2018 SWD PWD_well	May 27, 2019 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)		Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)	Jul. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)	Feb. 28, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2014
Related Party Transaction [Line Items]
Property, Plant and Equipment, Net			$ 958,145,000	$ 958,145,000	$ 457,944,000	[1]
Equity method investments			479,558,000	479,558,000	0	[1]
Asset retirement obligation			11,347,000	11,347,000	561,000		$ 383,000					$ 194,000
State income tax expense		$ 270,000	189,000		425,000		217,000
Asset Contribution Agreement
Related Party Transaction [Line Items]
Property, Plant and Equipment, Net									$ 208,600,000
Equity method investments									7,900,000
Asset retirement obligation									$ 400,000
Fair value of assets contributed											$ 46,700,000
Fasken Center Agreements
Related Party Transaction [Line Items]
Related party transaction amount				5,200,000
Crude Oil Gathering Agreement
Related Party Transaction [Line Items]
Revenue from related parties				9,900,000	16,000,000.0		7,600,000
Gas Gathering and Compression Agreement
Related Party Transaction [Line Items]
Revenue from related parties				14,300,000	6,400,000		2,900,000
Flowback Water Gathering and Disposal Agreement
Related Party Transaction [Line Items]
Revenue from related parties				$ 271,600,000	72,400,000		27,900,000
Exchange Agreement
Related Party Transaction [Line Items]
Unit exchange term, number of days for exchange calculation				20 days
Unit exchange term, calculation base			$ 1,000,000	$ 1,000,000
Unit exchange term, exchange ratio | shares			1	1
Sourced Water Services Agreement
Related Party Transaction [Line Items]
Revenue from related parties				$ 112,700,000	77,000,000.0
Equity Contribution Agreement
Related Party Transaction [Line Items]
Number of units exchanged (in shares) | shares		38,000,000
General Partner | Partnership Agreement
Related Party Transaction [Line Items]
Payment under Services and Secondment Agreement				400,000	0		0
General Partner | Asset Contribution Agreement
Related Party Transaction [Line Items]
Property, Plant and Equipment, Net								$ 297,600,000
Asset retirement obligation								$ 3,300,000
General Partner | Services and Secondment Agreement
Related Party Transaction [Line Items]
Payment under Services and Secondment Agreement				5,100,000	$ 0		$ 0
State | Tax Sharing Agreement
Related Party Transaction [Line Items]
State income tax expense				$ 200,000
HMW Fluid Management LLC | Asset Contribution Agreement
Related Party Transaction [Line Items]
Ownership Interest													25.00%
Sourced water asset | Asset Contribution Agreement
Related Party Transaction [Line Items]
Carrying value of assets contributed										$ 32,800,000
Sourced water asset, inventory | Asset Contribution Agreement
Related Party Transaction [Line Items]
Carrying value of assets contributed										$ 6,000,000.0
Produced Water Disposal Wells | HMW Fluid Management LLC | Asset Contribution Agreement
Related Party Transaction [Line Items]
Ownership percentage of oil and gas property	50.00%
Number of oil and gas properties | PWD_well	2
HMW Fluid Management LLC | Produced Water Disposal Wells
Related Party Transaction [Line Items]
Number of oil and gas properties | SWD	4

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