TRANSACTIONS WITH AFFILIATES (Details) $ / shares in Units, a in Millions				1 Months Ended			12 Months Ended				14 Months Ended
		Jan. 01, 2022 USD ($)	Nov. 09, 2018 contract	Dec. 31, 2020 USD ($) a $ / shares	Nov. 30, 2020 USD ($)	Jul. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) a agreement $ / shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017
Related Party Transaction [Line Items]
Number of service agreements with affiliates | agreement								3
General and administrative expenses	[1]							$ 13,155,000	$ 10,301,000	$ 7,368,000
Capitalized interest								$ 8,733,000	2,370,000	8,200,000
Capital distribution (in dollars per share) | $ / shares				$ 1.50				$ 1.50
Distributions paid to Preferred Unit limited partners				$ 24,400,000
Apache
Related Party Transaction [Line Items]
Distributions paid to Preferred Unit limited partners				18,800,000
Affiliated Entity | Apache
Related Party Transaction [Line Items]
Operations and maintenance expenses								$ 5,400,000	8,800,000	9,100,000
General and administrative expenses								7,000,000.0	5,400,000	6,500,000
Base rental charge								44,500
Lease expense								800,000	$ 1,100,000
Leases expense, prior to adoption of 842										$ 100,000
Initial term of lease agreement			4 years			30 months
Number of lease renewal term | contract			3
Lessee renewal term			24 months
The undiscounted future minimum lease payments for 2021				600,000				600,000
The undiscounted future minimum lease payments for 2022				$ 400,000				400,000
Monthly lease payments received from parent					$ 75,000	$ 110,000
Affiliated Entity | Apache | Construction, Operations and Maintenance Agreement
Related Party Transaction [Line Items]
Expenses from transactions with related party								$ 5,000,000.0			$ 3,000,000.0
Related party transaction, prior written notice period								30 days
Related party transaction, maximum direct or indirect interest ownership of voting or other equity securities								50.00%
Affiliated Entity | Apache | Construction, Operations and Maintenance Agreement | Scenario, Forecast
Related Party Transaction [Line Items]
Expenses from transactions with related party		$ 9,000,000.0					$ 7,000,000.0
Affiliated Entity | Apache | Purchase Rights and Restrictive Covenants Agreement
Related Party Transaction [Line Items]
Related party transaction agreement term, period after closing date								5 years
Gas and oil area developed (in acres) | a				1.7				1.7
Altus Midstream LP | Apache
Related Party Transaction [Line Items]
Limited partners, ownership interest			76.90%	76.90%				76.90%
Altus Midstream LP | Kayne Anderson Sponsor LLC
Related Party Transaction [Line Items]
Ownership percentage												10.00%

[1] Includes amounts of $7.0 million, $5.4 million, and $6.5 million associated with related parties for the years ended December 31, 2020, 2019, and 2018, respectively. Refer to Note 3—Transactions with Affiliates