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Derivative Instruments (Predecessor) (Details 2) (Interest rate swaps, Derivatives not designated as hedging instruments, Long-term liabilities-Derivatives instruments, USD $)
Mar. 31, 2015
Mar. 31, 2014
Interest rate swaps | Derivatives not designated as hedging instruments | Long-term liabilities-Derivatives instruments
   
Derivative asset and liability    
Liability derivatives $ 12,730,462us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= lpg_DerivativeInstrumentsNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
$ 14,062,416us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= lpg_DerivativeInstrumentsNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember