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Subsequent Events (Details) (Subsequent events, USD $)
In Millions, unless otherwise specified
 0 Months Ended
Apr. 01, 2015
item
May 15, 2015
Subsequent Events    
Approved discretionary cash bonus   $ 0.4lpg_CompensationExpenseBonusPayable
Executive management    
Subsequent Events    
Approved discretionary cash bonus   $ 1.5lpg_CompensationExpenseBonusPayable
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
Helios LPG Member    
Subsequent Events    
Number of VLGCs 7lpg_NumberOfVeryLargeGasCarrierVessels
/ dei_LegalEntityAxis
= lpg_HeliosLpgMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Number of VLGCs that are Dorian LPG's 3lpg_NumberOfVeryLargeGasCarrierVesselsOfDorianLpg
/ dei_LegalEntityAxis
= lpg_HeliosLpgMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Number of ECO vessels 1lpg_NumberOfFuelEfficientVeryLargeGasCarrierVessels
/ dei_LegalEntityAxis
= lpg_HeliosLpgMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Mitsui OSK Lines Ltd    
Subsequent Events    
Ownership interest of Helios LPG 100.00%lpg_OwnershipPercentageOfHeliosLpgPoolLlc
/ dei_LegalEntityAxis
= lpg_MitsuiOskLinesLtdMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember