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Partnership Formation and General Information - Vessel Owning Subsidiaries (Table) (Details) | 12 Months Ended
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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

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- 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

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- 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

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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
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=dlng_CleanEnergyMember
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: |