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Acquisitions (Details 7) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 6 Months Ended
Mar. 31, 2013
item
Mar. 31, 2014
Sep. 30, 2014
Mar. 31, 2012
Mar. 31, 2011
Jun. 19, 2012
Acquisitions            
Number of business acquired 2us-gaap_NumberOfBusinessesAcquired          
Cash paid, net of cash acquired $ 14,000us-gaap_PaymentsToAcquireBusinessesGross          
Estimated fair values of the assets acquired and liabilities assumed            
Goodwill 555,220us-gaap_Goodwill 1,107,006us-gaap_Goodwill 1,170,490us-gaap_Goodwill 167,245us-gaap_Goodwill 8,568us-gaap_Goodwill  
Vehicles | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   3 years        
Vehicles | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   25 years        
Buildings and leasehold improvements | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   3 years 3 years      
Buildings and leasehold improvements | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   40 years 40 years      
Crude oil tanks and related equipment            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment           17,851us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember
Crude oil tanks and related equipment | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   2 years 2 years      
Crude oil tanks and related equipment | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   40 years 40 years      
Crude Oil Logistics            
Acquisitions            
Number of business acquired   2us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
       
Value of common units issued   5,300us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
       
Cash paid, net of cash acquired   67,800us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
       
Common units issued   175,211us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
       
Estimated fair values of the assets acquired and liabilities assumed            
Accounts receivable - trade   1,235us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
1,221us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Inventories   1,021us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
1,021us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Prepaid expenses and other current assets   54us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
58us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Goodwill   37,867us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
30,730us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Accounts payable - trade   (665)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
(521)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Accrued expenses and other payables   (124)ngl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherPayables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
(266)ngl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherPayables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Fair value of net assets acquired   73,090us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
73,090us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Crude Oil Logistics | Estimated            
Estimated fair values of the assets acquired and liabilities assumed            
Accounts receivable - trade   1,235us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
       
Inventories   1,021us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
       
Prepaid expenses and other current assets   54us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
       
Goodwill   37,867us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
       
Accounts payable - trade   (665)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
       
Accrued expenses and other payables   (124)ngl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherPayables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
       
Fair value of net assets acquired   73,090us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
       
Crude Oil Logistics | Change            
Estimated fair values of the assets acquired and liabilities assumed            
Accounts receivable - trade     (14)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_PurchasePriceAllocationAdjustmentsMember
     
Prepaid expenses and other current assets     4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_PurchasePriceAllocationAdjustmentsMember
     
Goodwill     (7,137)us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_PurchasePriceAllocationAdjustmentsMember
     
Accounts payable - trade     144us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_PurchasePriceAllocationAdjustmentsMember
     
Accrued expenses and other payables     (142)ngl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherPayables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_PurchasePriceAllocationAdjustmentsMember
     
Crude Oil Logistics | Customer relationships            
Estimated fair values of the assets acquired and liabilities assumed            
Intangible assets   6,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
13,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
     
Useful life of intangible assets   3 years 3 years      
Crude Oil Logistics | Customer relationships | Estimated            
Estimated fair values of the assets acquired and liabilities assumed            
Intangible assets   6,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
       
Crude Oil Logistics | Customer relationships | Change            
Estimated fair values of the assets acquired and liabilities assumed            
Intangible assets     7,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_PurchasePriceAllocationAdjustmentsMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
     
Crude Oil Logistics | Non-compete agreements            
Estimated fair values of the assets acquired and liabilities assumed            
Intangible assets   35us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
35us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
     
Useful life of intangible assets   3 years 3 years      
Crude Oil Logistics | Non-compete agreements | Estimated            
Estimated fair values of the assets acquired and liabilities assumed            
Intangible assets   35us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
       
Crude Oil Logistics | Trade names            
Estimated fair values of the assets acquired and liabilities assumed            
Intangible assets   530us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
530us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
     
Crude Oil Logistics | Trade names | Estimated            
Estimated fair values of the assets acquired and liabilities assumed            
Intangible assets   530us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
       
Crude Oil Logistics | Vehicles            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   2,977us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
2,980us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
     
Crude Oil Logistics | Vehicles | Estimated            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   2,977us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
       
Crude Oil Logistics | Vehicles | Change            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment     3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_PurchasePriceAllocationAdjustmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
     
Crude Oil Logistics | Vehicles | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   5 years 5 years      
Crude Oil Logistics | Vehicles | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   10 years 10 years      
Crude Oil Logistics | Buildings and leasehold improvements            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   280us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember
58us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember
     
Crude Oil Logistics | Buildings and leasehold improvements | Estimated            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   280us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember
       
Crude Oil Logistics | Buildings and leasehold improvements | Change            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment     (222)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_PurchasePriceAllocationAdjustmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember
     
Crude Oil Logistics | Buildings and leasehold improvements | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   5 years 5 years      
Crude Oil Logistics | Buildings and leasehold improvements | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   30 years 30 years      
Crude Oil Logistics | Crude oil tanks and related equipment            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   3,462us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember
3,822us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember
     
Crude Oil Logistics | Crude oil tanks and related equipment | Estimated            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   3,462us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember
       
Crude Oil Logistics | Crude oil tanks and related equipment | Change            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment     360us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_PurchasePriceAllocationAdjustmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember
     
Crude Oil Logistics | Crude oil tanks and related equipment | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   2 years 2 years      
Crude Oil Logistics | Crude oil tanks and related equipment | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   30 years 30 years      
Crude Oil Logistics | Barges and towboats            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   20,065us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BargesAndTowboatsMember
20,065us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BargesAndTowboatsMember
     
Useful life of property, plant and equipment   20 years 20 years      
Crude Oil Logistics | Barges and towboats | Estimated            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   20,065us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BargesAndTowboatsMember
       
Crude Oil Logistics | Other            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   53us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
57us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
     
Crude Oil Logistics | Other | Estimated            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   53us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_ScenarioPreviouslyReportedMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
       
Crude Oil Logistics | Other | Change            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment     4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= us-gaap_PurchasePriceAllocationAdjustmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
     
Crude Oil Logistics | Other | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   3 years 3 years      
Crude Oil Logistics | Other | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   5 years 5 years