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Partnership Formation and General Information - Non-Vessel Owning Subsidiaries (Table) (Details)	12 Months Ended
	Dec. 31, 2017
Dynagas Operating GP LLC.
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership interest in subsidiary	100.00%
Dynagas Operating LP.
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership interest in subsidiary	100.00%

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

- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611443-123010

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=dlng_DynagasOperatingGPLLCMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=dlng_DynagasOperatingLPMember
Namespace Prefix:
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Period Type: