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Related Party Transactions - Commercial Agreements (Details)	9 Months Ended
	Sep. 30, 2020
Minimum [Member]
Related Party Transaction [Line Items]
Commercial Agreements, Initial Term	5 years
Maximum
Related Party Transaction [Line Items]
Commercial Agreements, Initial Term	10 years

X

- Definition

Commercial Agreements, Initial Term

+ References

No definition available.

+ Details

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Namespace Prefix:	dkl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: