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Partnership Formation and General Information - Vessel Owning Subsidiaries (Table) (Details) | 12 Months Ended
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Dec. 31, 2019
Clean Energy |
Property, Plant and Equipment [Line Items] |
Delivery date from shipyard | March 2007
Delivery date to Partnership | May 2013
Cbm Capacity | 149,700
Ob River |
Property, Plant and Equipment [Line Items] |
Delivery date from shipyard | July 2007
Delivery date to Partnership | May 2013
Cbm Capacity | 149,700
Amur River |
Property, Plant and Equipment [Line Items] |
Delivery date from shipyard | January 2008
Delivery date to Partnership | May 2013
Cbm Capacity | 149,700
Arctic Aurora |
Property, Plant and Equipment [Line Items] |
Delivery date from shipyard | July 2013
Delivery date to Partnership | June 2014
Cbm Capacity | 155,000
Yenisei River |
Property, Plant and Equipment [Line Items] |
Delivery date from shipyard | July 2013
Delivery date to Partnership | September 2014
Cbm Capacity | 155,000
Lena River |
Property, Plant and Equipment [Line Items] |
Delivery date from shipyard | October 2013
Delivery date to Partnership | December 2015
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

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- Definition The date the vessel is delivered from the shipyard. + References No definition available. + Details
Name: | dlng_LNGCarrierDeliveryDateFromShipyard
Namespace Prefix: | dlng_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The date the vessel is delivered to the partnership. + References No definition available. + Details
Name: | dlng_LNGCarrierDeliveryDateToPartnership
Namespace Prefix: | dlng_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- 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
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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