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Commitments and Contingencies (Details 2) (Pipeline Capacity Agreements, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Pipeline Capacity Agreements
 
Pipeline Capacity Agreements  
2015 (six months) $ 41,822us-gaap_ContractualObligationFutureMinimumPaymentsDueRemainderOfFiscalYear
/ us-gaap_TypeOfArrangementAxis
= ngl_PipelineCapacityAgreementsMember
2016 95,050us-gaap_ContractualObligationDueInSecondYear
/ us-gaap_TypeOfArrangementAxis
= ngl_PipelineCapacityAgreementsMember
2017 82,916us-gaap_ContractualObligationDueInThirdYear
/ us-gaap_TypeOfArrangementAxis
= ngl_PipelineCapacityAgreementsMember
2018 62,565us-gaap_ContractualObligationDueInFourthYear
/ us-gaap_TypeOfArrangementAxis
= ngl_PipelineCapacityAgreementsMember
2019 51,278us-gaap_ContractualObligationDueInFifthYear
/ us-gaap_TypeOfArrangementAxis
= ngl_PipelineCapacityAgreementsMember
Thereafter 107,537us-gaap_ContractualObligationDueAfterFifthYear
/ us-gaap_TypeOfArrangementAxis
= ngl_PipelineCapacityAgreementsMember
Total $ 441,168us-gaap_ContractualObligation
/ us-gaap_TypeOfArrangementAxis
= ngl_PipelineCapacityAgreementsMember