Vessel Operating 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
Vessel Operating Expenses
Crew wages and related costs	$ 5,306,441us-gaap_SalariesAndWages	$ 14,529,018us-gaap_SalariesAndWages
Spares and stores	1,395,287lpg_CostOfSparesAndStores	2,666,100lpg_CostOfSparesAndStores
Lubricants	480,279lpg_CostOfLubricants	964,951lpg_CostOfLubricants
Insurance	566,021lpg_CostOfInsurance	1,343,071lpg_CostOfInsurance
Repairs and maintenance costs	502,424	1,315,028
Miscellaneous expenses	144,507us-gaap_OtherCostAndExpenseOperating	437,997us-gaap_OtherCostAndExpenseOperating
Total	8,394,959lpg_VesselOperatingExpenses	21,256,165lpg_VesselOperatingExpenses
Predecessor
Vessel Operating Expenses
Crew wages and related costs			2,519,315	7,932,836
Spares and stores			1,284,161	1,502,111
Lubricants			176,502	686,375
Insurance			298,249	942,847
Repairs and maintenance costs			279,921	848,576
Miscellaneous expenses			80,577	126,181
Total			$ 4,638,725	$ 12,038,926

Represents the amount of expenses incurred on insurance.

No definition available.

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

- Definition

Represents the amount of expenses incurred on lubricants.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount of expenses incurred on spares and stores.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount of vessel operating expenses incurred during the reported period.

+ References

No definition available.

+ Details

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

- Details

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

- Definition

The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

+ References

+ Details

Name:	us-gaap_CostOfPropertyRepairsAndMaintenance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Article 5

+ Details

Name:	us-gaap_OtherCostAndExpenseOperating
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Expenditures for salaries other than officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

+ References

+ Details

Name:	us-gaap_SalariesAndWages
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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