Voyage Expenses (Predecessor) (Details) (USD $)	9 Months Ended	12 Months Ended	4 Months Ended	12 Months Ended
Mar. 31, 2014	Mar. 31, 2015	Jul. 28, 2013	Mar. 31, 2013
Voyage Expenses
Brokers commission	$ 386,244lpg_BrokersCommissionExpense	$ 1,703,589lpg_BrokersCommissionExpense
Bunkers	5,271,126lpg_BunkerExpenses	15,678,905lpg_BunkerExpenses
Port charges and other related expenses	552,634lpg_PortChargesAndOtherRelatedExpenses	3,603,707lpg_PortChargesAndOtherRelatedExpenses
Security cost	298,820lpg_SecurityCostExpenses	709,035lpg_SecurityCostExpenses
War risk insurances	37,001lpg_WarRiskInsurancesExpense	146,320lpg_WarRiskInsurancesExpense
Other voyage expenses	125,146lpg_OtherVoyageExpenses	240,300lpg_OtherVoyageExpenses
Total voyage expenses	6,670,971lpg_VoyageExpenses	22,081,856lpg_VoyageExpenses
Predecessor
Voyage Expenses
Brokers commission			396,720	1,025,761
Bunkers			2,755,445	6,678,660
Port charges and other related expenses			391,091	746,574
Security cost			206,940	582,112
War risk insurances			26,673	111,626
Other voyage expenses			45,363	112,450
Total voyage expenses			$ 3,822,232	$ 9,257,183

Represents the amount of expenses incurred for broker commissions.

No definition available.

Name:	lpg_BrokersCommissionExpense
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the amount of expenses incurred for bunkers.

No definition available.

Represents the amount of voyage expenses other than bunkers, port charges, broker commissions, security cost, war risk insurance and other charges.

No definition available.

Represents the amount of expenses incurred for port charges and other related expenses.

No definition available.

Name:	lpg_PortChargesAndOtherRelatedExpenses
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the amount of expenses incurred for security.

No definition available.

Represents the amount of voyage expenses incurred during the reported period.

No definition available.

Name:	lpg_VoyageExpensesLineItems
Namespace Prefix:	lpg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the amount of expenses incurred for war risk insurances.

No definition available.

Name:	lpg_WarRiskInsurancesExpense
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: