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Subsequent Events (Details) (USD $)
12 Months Ended 6 Months Ended 1 Months Ended 2 Months Ended
Mar. 31, 2013
Sep. 30, 2014
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Nov. 30, 2014
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Nov. 30, 2014
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Dec. 31, 2014
Subsequent events          
Cash paid for water facilities $ 14,000,000us-gaap_PaymentsToAcquireBusinessesGross        
Water Solutions Facility          
Subsequent events          
Number of water disposal facilities acquired   4ngl_BusinessAcquisitionNumberOfWaterDisposalFacilitiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= ngl_WaterSolutionsFacilitiesMember
     
Cash paid for water facilities   82,900,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ngl_WaterSolutionsFacilitiesMember
     
Subsequent event | Sale of natural gas liquids terminals          
Subsequent events          
Loss on disposal         29,000,000us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalNetOfTax
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= ngl_SaleOfNaturalGasLiquidsTerminalMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Loss on disposal allocated to property, plant and equipment         21,000,000ngl_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalAllocatedToPropertyPlantAndEquipment
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= ngl_SaleOfNaturalGasLiquidsTerminalMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Loss on disposal allocated to goodwill         8,000,000ngl_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalAllocatedToGoodwill
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= ngl_SaleOfNaturalGasLiquidsTerminalMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent event | Water Solutions Facility          
Subsequent events          
Number of water disposal facilities acquired     5ngl_BusinessAcquisitionNumberOfWaterDisposalFacilitiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= ngl_WaterSolutionsFacilitiesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
5ngl_BusinessAcquisitionNumberOfWaterDisposalFacilitiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= ngl_WaterSolutionsFacilitiesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Cash paid for water facilities     $ 65,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ngl_WaterSolutionsFacilitiesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
$ 52,200,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ngl_WaterSolutionsFacilitiesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember