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Interest and Finance Cost (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
Interest and Finance Cost        
Interest on long-term debt $ 1,666,159us-gaap_InterestExpenseDebt $ 2,657,943us-gaap_InterestExpenseDebt    
Other finance costs 84,251lpg_OtherFinanceCosts 301,868lpg_OtherFinanceCosts    
Predecessor        
Interest and Finance Cost        
Interest on long-term debt     659,832us-gaap_InterestExpenseDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 2,434,235us-gaap_InterestExpenseDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Other finance costs     $ 102,983lpg_OtherFinanceCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 $ 134,750lpg_OtherFinanceCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember