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Goodwill - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Mar. 01, 2017
Goodwill [Line Items]
Goodwill	$ 46,600,000	$ 45,200,000	$ 46,600,000	$ 45,200,000
Goodwill impairment	$ 210,000,000.0		$ 210,000,000.0
Other Long-term Assets [Member]
Goodwill [Line Items]
Goodwill				$ 45,200,000
Acquisition of Gas Gathering and Processing and Crude Oil Gathering Assets in Permian Basin [Member]
Goodwill [Line Items]
Goodwill					$ 46,600,000
Former Permian Supersystem [Member]
Goodwill [Line Items]
Goodwill impairment		$ 0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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X

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

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+ References

No definition available.

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