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Subsequent Events (Predecessor) (Details) (Business combination, Dorian Holdings)
Jul. 29, 2013
CMNL LPG Transport LLC
  
Subsequent Events  
Interest transferred to Dorian LPG Ltd. (as a percent) 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
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= lpg_BusinessCombinationsMember
/ dei_LegalEntityAxis
= lpg_CMNLLPGTransportLLCMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpg_DorianHoldingsLLCMember
CJNP LPG Transport LLC
  
Subsequent Events  
Interest transferred to Dorian LPG Ltd. (as a percent) 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lpg_BusinessCombinationsMember
/ dei_LegalEntityAxis
= lpg_CJNPLPGTransportLLCMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpg_DorianHoldingsLLCMember
CNML LPG Transport LLC
  
Subsequent Events  
Interest transferred to Dorian LPG Ltd. (as a percent) 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lpg_BusinessCombinationsMember
/ dei_LegalEntityAxis
= lpg_CNMLLPGTransportLLCMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpg_DorianHoldingsLLCMember
Predecessor | Subsequent events | CMNL LPG Transport LLC  
Subsequent Events  
Interest transferred to Dorian LPG Ltd. (as a percent) 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lpg_BusinessCombinationsMember
/ dei_LegalEntityAxis
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpg_DorianHoldingsLLCMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_SubsequentEventTypeAxis
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Predecessor | Subsequent events | CJNP LPG Transport LLC  
Subsequent Events  
Interest transferred to Dorian LPG Ltd. (as a percent) 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lpg_BusinessCombinationsMember
/ dei_LegalEntityAxis
= lpg_CJNPLPGTransportLLCMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpg_DorianHoldingsLLCMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Predecessor | Subsequent events | CNML LPG Transport LLC  
Subsequent Events  
Interest transferred to Dorian LPG Ltd. (as a percent) 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lpg_BusinessCombinationsMember
/ dei_LegalEntityAxis
= lpg_CNMLLPGTransportLLCMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpg_DorianHoldingsLLCMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember