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Partnership Formation and General Information - Vessel Owning Subsidiaries (Table) (Details)	12 Months Ended
	Dec. 31, 2017
Clean Energy
Property, Plant and Equipment [Line Items]
Delivery Date	March 2007
Year Built	2007
Cbm Capacity	149,700
Ob River
Property, Plant and Equipment [Line Items]
Delivery Date	July 2007
Year Built	2007
Cbm Capacity	149,700
Amur River
Property, Plant and Equipment [Line Items]
Delivery Date	January 2008
Year Built	2008
Cbm Capacity	149,700
Arctic Aurora
Property, Plant and Equipment [Line Items]
Delivery Date	June 2014
Year Built	2013
Cbm Capacity	155,000
Yenisei River
Property, Plant and Equipment [Line Items]
Delivery Date	September 2014
Year Built	2013
Cbm Capacity	155,000
Lena River
Property, Plant and Equipment [Line Items]
Delivery Date	December 2015
Year Built	2013
Cbm Capacity	155,000

X

- Definition

The LNG carrier's capacity in cubic meters.

+ References

No definition available.

+ Details

Name:	dlng_LNGCarrierCapacity
Namespace Prefix:	dlng_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The date the LNG carrier was delivered to the Company.

+ References

No definition available.

+ Details

Name:	dlng_LNGCarrierDeliveryDate
Namespace Prefix:	dlng_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The date the LNG carrier was built.

+ References

No definition available.

+ Details

Name:	dlng_LNGCarrierYearBuilt
Namespace Prefix:	dlng_
Data Type:	xbrli:stringItemType
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

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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_CleanEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_ObRiverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_AmurRiverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_ArcticAuroraMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_YeniseiRiverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_LenaRiverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: