XML 117 R64.htm IDEA: XBRL DOCUMENT v2.4.1.9
Long-Term Debt (Details) (USD $)
9 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Mar. 26, 2015
item
Mar. 31, 2015
item
Presented as follows:        
Current portion of long-term debt $ 9,612,000us-gaap_LongTermDebtCurrent $ 15,677,553us-gaap_LongTermDebtCurrent   $ 15,677,553us-gaap_LongTermDebtCurrent
Long-term debt-net of current portion 119,106,500us-gaap_LongTermDebtNoncurrent 184,665,874us-gaap_LongTermDebtNoncurrent   184,665,874us-gaap_LongTermDebtNoncurrent
Total 128,718,500us-gaap_LongTermDebt 200,343,427us-gaap_LongTermDebt   200,343,427us-gaap_LongTermDebt
Deferred financing fees 1,516,847us-gaap_PaymentsOfFinancingCosts 11,220,812us-gaap_PaymentsOfFinancingCosts    
Minimum annual principal payments        
2016   15,677,553us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths   15,677,553us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2017   15,677,553us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo   15,677,553us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2018   15,677,553us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree   15,677,553us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2019   63,333,553us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour   63,333,553us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2020   9,720,553us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive   9,720,553us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter   80,256,662us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive   80,256,662us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
2015 Debt Facility        
Presented as follows:        
Total   81,236,927us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
81,200,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
81,236,927us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Deferred financing fees     2,500,000us-gaap_PaymentsOfFinancingCosts
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
 
Balance available to be drawn   676,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  676,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Number of VLGC newbuildings secured by loan       18lpg_NumberOfVlgcNewbuildingsSecuredByLoan
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Loan-to-contract cost ratio before fees (as a percent)       55.00%lpg_LoanToContractCostRatioBeforeFees
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Commitment fee (as a percent)       40.00%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Capitalized debt issuance costs   13,400,000us-gaap_DeferredFinanceCostsCurrentGross
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  13,400,000us-gaap_DeferredFinanceCostsCurrentGross
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Original loan amount   758,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  758,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Number of tranches in which loan facility is divided     4lpg_LoanFacilityNumberOfTranches
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
4lpg_LoanFacilityNumberOfTranches
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Current assets divided by current liabilities ratio   100.00%lpg_DebtInstrumentCovenantsCurrentRatio
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  100.00%lpg_DebtInstrumentCovenantsCurrentRatio
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Minimum stockholder's equity balance   400,000,000lpg_DebtInstrumentCovenantsMinimumStockholdersEquityBalance
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  400,000,000lpg_DebtInstrumentCovenantsMinimumStockholdersEquityBalance
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Percent of any new equity raised after closing date   50.00%lpg_DebtInstrumentCovenantsMinimumStockholdersEquityPercentOfNewEquityRaisedAfterClosingDate
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  50.00%lpg_DebtInstrumentCovenantsMinimumStockholdersEquityPercentOfNewEquityRaisedAfterClosingDate
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Percent of positive net income for the immediately preceding financial year   25.00%lpg_DebtInstrumentCovenantsMinimumStockholdersEquityPercentOfPositiveNetIncomeForImmediatelyPrecedingFiscalYear
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
   
Minimum interest coverage ratio for following 12 month period   100.00%lpg_DebtInstrumentCovenantsMinimumConsolidatedEbitdaToConsolidatedNetInterestExpenseForFirstTwelveMonths
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  100.00%lpg_DebtInstrumentCovenantsMinimumConsolidatedEbitdaToConsolidatedNetInterestExpenseForFirstTwelveMonths
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Minimum interest coverage ratio for following subsequent year   150.00%lpg_DebtInstrumentCovenantsMinimumConsolidatedEbitdaToConsolidatedNetInterestExpenseForSecondYear
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  150.00%lpg_DebtInstrumentCovenantsMinimumConsolidatedEbitdaToConsolidatedNetInterestExpenseForSecondYear
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Minimum interest coverage ratio for following third year   200.00%lpg_DebtInstrumentCovenantsMinimumConsolidatedEbitdaToConsolidatedNetInterestExpenseForThirdYear
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  200.00%lpg_DebtInstrumentCovenantsMinimumConsolidatedEbitdaToConsolidatedNetInterestExpenseForThirdYear
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Minimum interest coverage ratio for thereafter   250.00%lpg_DebtInstrumentCovenantsMinimumConsolidatedEbitdaToConsolidatedNetInterestExpenseForThereafter
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  250.00%lpg_DebtInstrumentCovenantsMinimumConsolidatedEbitdaToConsolidatedNetInterestExpenseForThereafter
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Maximum consolidated net debt to consolidated total capitalization ratio   60.00%lpg_DebtInstrumentCovenantsConsolidatedNetDebtToConsolidatedTotalCapitalizationRatio
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  60.00%lpg_DebtInstrumentCovenantsConsolidatedNetDebtToConsolidatedTotalCapitalizationRatio
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Minimum cash balance   25,000,000lpg_DebtInstrumentCovenantsMinimumCAshRequirementAggregateScenarioOneMinimumCashBalance
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  25,000,000lpg_DebtInstrumentCovenantsMinimumCAshRequirementAggregateScenarioOneMinimumCashBalance
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Minimum cash balance for every vessel delivered   1,100,000lpg_DebtInstrumentCovenantsMinimumCAshRequirementAggregateScenarioOneMinimumCashBalanceForEveryVesselDeliveredAndFinanced
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  1,100,000lpg_DebtInstrumentCovenantsMinimumCAshRequirementAggregateScenarioOneMinimumCashBalanceForEveryVesselDeliveredAndFinanced
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Percent of consolidated interest bearing debt outstanding   5.00%lpg_DebtInstrumentCovenantsMinimumCAshRequirementAggregateScenarioTwoPercentOfConsolidatedInterestBearingDebtOutstanding
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
  5.00%lpg_DebtInstrumentCovenantsMinimumCAshRequirementAggregateScenarioTwoPercentOfConsolidatedInterestBearingDebtOutstanding
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
Minimum percent of any additional security then held by the security agent to outstanding loan balance   135.00%lpg_DebtInstrumentCovenantsMinimumPercentageOfAnyAdditionalSecurityThenHeldBySecurityAgentToOutstandingLoanBalance
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
   
Amount of dividend shall be paid if an event of default has occurred or is continuing   0lpg_DebtInstrumentCovenantsDividendAmountIfEventOfDefault
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
   
2015 Debt Facility | LIBOR        
Presented as follows:        
Interest Rate   0.27%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
  0.27%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= lpg_DebtFacility2015Member
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
2015 Debt Facility | Minimum | LIBOR        
Presented as follows:        
Variable interest rate basis   Three month LIBOR    
2015 Debt Facility | Maximum | LIBOR        
Presented as follows:        
Variable interest rate basis   Six month LIBOR    
Commercial Financing        
Presented as follows:        
Total   26,695,381us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
  26,695,381us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
Term   7 years    
Interest Rate   3.02%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
  3.02%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
Original loan amount   249,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
  249,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
Commercial Financing | LIBOR        
Presented as follows:        
Margin added to LIBOR for interest rate on loan facility   2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Variable interest rate basis   Three or six month LIBOR    
Commercial Financing | 50% or more but less than 75% vessels financed are employed under time charters | LIBOR        
Presented as follows:        
Margin added to LIBOR for interest rate on loan facility   2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
/ us-gaap_StatementScenarioAxis
= lpg_ScenarioDebtInstrumentCovenantOneMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Commercial Financing | 75% or more vessels financed are employed under time charters | LIBOR        
Presented as follows:        
Margin added to LIBOR for interest rate on loan facility   2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
/ us-gaap_StatementScenarioAxis
= lpg_ScenarioDebtInstrumentCovenantTwoMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Commercial Financing | Minimum | 50% or more but less than 75% vessels financed are employed under time charters        
Presented as follows:        
Percent of vessels financed that are employed under time charters   50.00%lpg_PercentageOfVesselsFinancedThatAreEmployedUnderTimeCharters
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= lpg_ScenarioDebtInstrumentCovenantOneMember
  50.00%lpg_PercentageOfVesselsFinancedThatAreEmployedUnderTimeCharters
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= lpg_ScenarioDebtInstrumentCovenantOneMember
Commercial Financing | Minimum | 75% or more vessels financed are employed under time charters        
Presented as follows:        
Percent of vessels financed that are employed under time charters   75.00%lpg_PercentageOfVesselsFinancedThatAreEmployedUnderTimeCharters
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= lpg_ScenarioDebtInstrumentCovenantTwoMember
  75.00%lpg_PercentageOfVesselsFinancedThatAreEmployedUnderTimeCharters
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= lpg_ScenarioDebtInstrumentCovenantTwoMember
Commercial Financing | Maximum | 50% or more but less than 75% vessels financed are employed under time charters        
Presented as follows:        
Percent of vessels financed that are employed under time charters   75.00%lpg_PercentageOfVesselsFinancedThatAreEmployedUnderTimeCharters
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= lpg_ScenarioDebtInstrumentCovenantOneMember
  75.00%lpg_PercentageOfVesselsFinancedThatAreEmployedUnderTimeCharters
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheCommercialFinancingMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= lpg_ScenarioDebtInstrumentCovenantOneMember
KEXIM Direct Financing        
Presented as follows:        
Total   21,890,212us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximDirectFinancingMember
  21,890,212us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximDirectFinancingMember
Term   12 years    
Interest Rate   2.72%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximDirectFinancingMember
  2.72%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximDirectFinancingMember
Original loan amount   204,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximDirectFinancingMember
  204,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximDirectFinancingMember
KEXIM Direct Financing | LIBOR        
Presented as follows:        
Margin added to LIBOR for interest rate on loan facility   2.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximDirectFinancingMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Variable interest rate basis   Three month LIBOR    
KEXIM Guaranteed and K-sure Insured        
Presented as follows:        
Original loan amount   305,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximGuaranteedAndKSureInsuredMember
  305,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximGuaranteedAndKSureInsuredMember
KEXIM Guaranteed        
Presented as follows:        
Total   21,655,293us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximGuaranteedMember
  21,655,293us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximGuaranteedMember
Term   12 years    
Interest Rate   1.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximGuaranteedMember
  1.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximGuaranteedMember
Original loan amount   202,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximGuaranteedMember
  202,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximGuaranteedMember
KEXIM Guaranteed | LIBOR        
Presented as follows:        
Margin added to LIBOR for interest rate on loan facility   1.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKeximGuaranteedMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Variable interest rate basis   Three month LIBOR    
K-sure Insured        
Presented as follows:        
Total   10,996,041us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKSureInsuredMember
  10,996,041us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKSureInsuredMember
Term   12 years    
Interest Rate   1.77%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKSureInsuredMember
  1.77%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKSureInsuredMember
Original loan amount   103,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKSureInsuredMember
  103,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKSureInsuredMember
K-sure Insured | LIBOR        
Presented as follows:        
Margin added to LIBOR for interest rate on loan facility   1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFrom2015DebtFacilityTrancheKSureInsuredMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Variable interest rate basis   Three month LIBOR    
Royal Bank of Scotland plc (RBS)        
Presented as follows:        
Total 128,718,500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
119,106,500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  119,106,500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Original loan amount   135,224,500us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  135,224,500us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Number of tranches in which loan facility is divided   3lpg_LoanFacilityNumberOfTranches
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
   
Minimum market adjusted security cover ratio as percentage of aggregate outstanding loan balance   125.00%lpg_DebtInstrumentMinimumMarketAdjustedSecurityCoverRatio
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  125.00%lpg_DebtInstrumentMinimumMarketAdjustedSecurityCoverRatio
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Period after non-compliance of minimum market adjusted security cover ratio and percentage of debt swap exposure prepayment required to be made   1 month    
Minimum market adjusted security cover ratio as percentage of aggregate outstanding loan balance in the event of lender release   175.00%lpg_DebtInstrumentMinimumMarketAdjustedSecurityCoverRatioInEventLenderRelease
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  175.00%lpg_DebtInstrumentMinimumMarketAdjustedSecurityCoverRatioInEventLenderRelease
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Margin in the event of lender release (as a percent)   2.75%lpg_DebtInstrumentBasisSpreadOnVariableRateInEventLenderRelease
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  2.75%lpg_DebtInstrumentBasisSpreadOnVariableRateInEventLenderRelease
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Debt service coverage ratio   100.00%lpg_DebtInstrumentCovenantsDebtServiceCoverageRatio
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  100.00%lpg_DebtInstrumentCovenantsDebtServiceCoverageRatio
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Minimum Shareholders' funds as adjusted for any reduction in the vessel fair market value   85,000,000lpg_DebtInstrumentCovenantsMinimumShareholdersFundAsAdjusted
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  85,000,000lpg_DebtInstrumentCovenantsMinimumShareholdersFundAsAdjusted
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Minimum cash balance at the end of each quarter   10,000,000lpg_DebtInstrumentCovenantsMinimumCashBalanceAtTheEndOfEachQuarter
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  10,000,000lpg_DebtInstrumentCovenantsMinimumCashBalanceAtTheEndOfEachQuarter
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Minimum cash per mortgaged vessel   1,500,000lpg_DebtInstrumentCovenantsMinimumCashBalancePerMortgageVessel
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  1,500,000lpg_DebtInstrumentCovenantsMinimumCashBalancePerMortgageVessel
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Ratio of total debt to shareholders funds   150.00%lpg_DebtInstrumentCovenantsDebtEquityRatio
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  150.00%lpg_DebtInstrumentCovenantsDebtEquityRatio
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Percent of swap exposure added to market value of vessels securing the loan   100.00%lpg_DebtInstrumentCovenantsPercentOfRelatedSwapExposureAddedToMarketValueOfVesselsSecuringLoan
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  100.00%lpg_DebtInstrumentCovenantsPercentOfRelatedSwapExposureAddedToMarketValueOfVesselsSecuringLoan
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Minimum aggregate market value of vessels securing loan and related swap exposure   125.00%lpg_DebtInstrumentCovenantsMinimumPercentOfAggregateMarketValueOfVesselsSecuringLoanAndRelatedSwapExposure
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
  125.00%lpg_DebtInstrumentCovenantsMinimumPercentOfAggregateMarketValueOfVesselsSecuringLoanAndRelatedSwapExposure
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
Amount of dividend shall be paid if an event of default has occurred or is continuing   0lpg_DebtInstrumentCovenantsDividendAmountIfEventOfDefault
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
   
Royal Bank of Scotland plc (RBS) | Prior to September 26, 2014        
Presented as follows:        
Minimum percentage of debt swap exposure required to be maintained   50.00%lpg_DebtInstrumentMinimumPercentageOfDebtSwapExposureRequiredToBeMaintained
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
/ lpg_PeriodAxis
= lpg_PeriodOneMember
   
Royal Bank of Scotland plc (RBS) | Prior to September 26, 2014 | LIBOR        
Presented as follows:        
Margin added to LIBOR for interest rate on loan facility   1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
/ lpg_PeriodAxis
= lpg_PeriodOneMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Variable interest rate basis   LIBOR    
Royal Bank of Scotland plc (RBS) | After September 26, 2015 | LIBOR        
Presented as follows:        
Margin added to LIBOR for interest rate on loan facility   2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
/ lpg_PeriodAxis
= lpg_PeriodThreeMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Royal Bank of Scotland plc (RBS) | From September 26, 2014 through September 25, 2015        
Presented as follows:        
Minimum percentage of debt swap exposure required to be maintained   100.00%lpg_DebtInstrumentMinimumPercentageOfDebtSwapExposureRequiredToBeMaintained
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
/ lpg_PeriodAxis
= lpg_PeriodTwoMember
   
Royal Bank of Scotland plc (RBS) | From September 26, 2014 through September 25, 2015 | LIBOR        
Presented as follows:        
Margin added to LIBOR for interest rate on loan facility   2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcMember
/ lpg_PeriodAxis
= lpg_PeriodTwoMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Variable interest rate basis   LIBOR    
Tranche A        
Presented as follows:        
Total 44,200,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheAMember
40,800,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheAMember
  40,800,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheAMember
Original loan amount   47,600,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheAMember
  47,600,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheAMember
Number of semi annual installments   12lpg_DebtInstrumentNumberOfInstallments
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheAMember
   
Semi-annual installment   1,700,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheAMember
   
Balloon payment   27,200,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheAMember
  27,200,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheAMember
Tranche B        
Presented as follows:        
Total 33,241,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheBMember
30,684,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheBMember
  30,684,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheBMember
Original loan amount   34,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheBMember
  34,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheBMember
Number of semi annual installments   11lpg_DebtInstrumentNumberOfInstallments
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheBMember
   
Semi-annual installment   1,278,500us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheBMember
   
Balloon payment   20,456,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheBMember
  20,456,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheBMember
Tranche C        
Presented as follows:        
Total 51,277,500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheCMember
47,622,500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheCMember
  47,622,500us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheCMember
Original loan amount   53,100,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheCMember
  53,100,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheCMember
Number of semi annual installments   14lpg_DebtInstrumentNumberOfInstallments
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheCMember
   
Semi-annual installment   1,827,500us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheCMember
   
Balloon payment   $ 27,520,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheCMember
  $ 27,520,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_DebtInstrumentAxis
= lpg_SecuredBankDebtFromRoyalBankOfScotlandPlcTrancheCMember