Represents the number of fuel-efficient Eco-design Very Large Gas Carrier vessels in current fleet having a capacity of 84,000 cubic meters.

No definition available.

Name:	lpg_NumberOfFuelEfficientVeryLargeGasCarrierVesselsEightyFourThousandCapacity
Namespace Prefix:	lpg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of pressurized vessels in current fleet having a capacity of 5,000 cubic meters.

No definition available.

Name:	lpg_NumberOfPressurizedGasCarrierVesselsFiveThousandCapacity
Namespace Prefix:	lpg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of Very Large Gas Carrier vessels in current fleet having a capacity of 82,000 cubic meters.

No definition available.

Name:	lpg_NumberOfVeryLargeGasCarrierVesselsEightyTwoThousandCapacity
Namespace Prefix:	lpg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of commitments under shipbuilding contracts and supervision agreements for VLGC newbuildings.

No definition available.

Name:	lpg_NumberOfVeryLargeGasCarrierVesselsUnderCommitment
Namespace Prefix:	lpg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of Very Large Gas Carrier vessels in the current fleet with minimum capacity of 80,000 cubic meters.

No definition available.

Name:	lpg_NumberOfVeryLargeGasCarrierVesselsWithMinimumEightyThousandCapacity
Namespace Prefix:	lpg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the operational time period of the vessels entered.

No definition available.

Name:	lpg_OperatingPeriodOfVesselsEntered
Namespace Prefix:	lpg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Basis of Presentation and General Information (Details) - item			3 Months Ended
	Jul. 23, 2015	Apr. 01, 2015	Jun. 30, 2015
Number of commitments under shipbuilding contracts and supervision agreements for VLGC newbuildings			13
Subsequent events
Number of VLGCs with minimum 80,000 cbm	11
Number of fuel-efficient ECO-design VLGCs having 84,000 cbm	7
Number of VLGCs having 82,000 cbm	3
Number of PGCs having 5,000 cbm	1
Number of commitments under shipbuilding contracts and supervision agreements for VLGC newbuildings	12
Maximum
Operating period of the vessels entered		2 years