Amount paid for pre-delivery fees.

No definition available.

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

- Definition

Represents the periodic pre-delivery fee payable per vessel.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount of cost reimbursed by the Company for employee related travel costs.

+ References

No definition available.

+ Details

Name:	lpg_RelatedPartyTransactionsEmployeeRelatedCostReimbursed
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the time period pursuant to agreement entered.

+ References

No definition available.

+ Details

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

- Definition

Amount paid to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_PaymentForManagementFee
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_CounterpartyNameAxis=lpg_EagleOceanTransportIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lpg_DorianHellasSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lpg_HeliosLPGPoolLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Transactions with Related Parties (Details) - USD ($)			3 Months Ended
Transactions with Related Parties (Details) - USD ($)	Jul. 01, 2014	Jul. 29, 2013	Jun. 30, 2015	Jun. 30, 2014
Transactions with Related Parties
Fees for chartering and operational services			$ 383,642
Eagle Ocean Transport
Transactions with Related Parties
Reimbursed related travel costs			300,000
Manager
Transactions with Related Parties
Management fees for vessels			0	$ 0
Monthly pre-delivery fee per vessel		$ 15,000
Pre-delivery fees paid				$ 900,000
Time period pursuant to agreement	1 year
Manager \| Maximum
Transactions with Related Parties
Fees for chartering and operational services			100,000
Helios LPG Pool LLC
Transactions with Related Parties
Fees for chartering and operational services			$ 400,000