The amount of current liabilities in excess of current assets.

No definition available.

Name:	lpg_CurrentLiabilitiesInExcessOfCurrentAssets
Namespace Prefix:	lpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the number of VLGC secured by loan agreement.

+ References

No definition available.

+ Details

Name:	lpg_DebtInstrumentCovenantsNumberOfVlgcSecured
Namespace Prefix:	lpg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of vessels refinanced.

+ References

No definition available.

+ Details

Name:	lpg_NumberOfVesselsRefinanced
Namespace Prefix:	lpg_
Data Type:	xbrli:integerItemType
Balance Type:	na
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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=lpg_DebtFacility2017BridgeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Going Concern (Details)	Nov. 07, 2017 USD ($) item	Dec. 31, 2017 USD ($)	Jun. 08, 2017 item	Mar. 31, 2017 USD ($)
Going Concern
Amount of current liabilities in excess of current assets		$ 50,400,000
Current portion of long-term debt		126,557,191		$ 65,978,785
2017 Bridge Loan
Going Concern
Current portion of long-term debt	$ 66,900,000	$ 66,900,000
Number of vessels refinanced \| item	1
Number of VLGC secured by loan agreement \| item	4		4
Repayment of debt	$ 30,100,000