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Owners' Capital (Predecessor) (Details) (USD $)
 12 Months Ended
Mar. 31, 2015
item
Mar. 31, 2013
item
Jul. 01, 2013
Owners' Capital      
Number of registered and/or bearer shares into which authorized share capital of each ship owning entity is divided     500,000,000lpg_CapitalStockSharesAuthorized
Par value of registered and/or bearer shares of each ship owning entity (in dollars per share)     $ 0.01lpg_CapitalStockParOrStatedValuePerShare
Number of votes entitled to shareholders 1lpg_NumberOfVotesEntitledToShareholders    
Predecessor      
Owners' Capital      
Number of registered and/or bearer shares into which authorized share capital of each ship owning entity is divided   500lpg_CapitalStockSharesAuthorized
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
Par value of registered and/or bearer shares of each ship owning entity (in dollars per share)   $ 0.00lpg_CapitalStockParOrStatedValuePerShare
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
Number of votes entitled to shareholders   1lpg_NumberOfVotesEntitledToShareholders
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember