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Acquisitions (Details 2) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Aug. 02, 2013
Mar. 31, 2011
Estimated fair values of the assets acquired and liabilities assumed                                
Goodwill $ 1,170,490,000us-gaap_Goodwill $ 1,107,006,000us-gaap_Goodwill       $ 555,220,000us-gaap_Goodwill       $ 1,170,490,000us-gaap_Goodwill   $ 1,107,006,000us-gaap_Goodwill $ 555,220,000us-gaap_Goodwill $ 167,245,000us-gaap_Goodwill   $ 8,568,000us-gaap_Goodwill
Consideration paid for acquisition                                
Cash paid, net of cash acquired                         14,000,000us-gaap_PaymentsToAcquireBusinessesGross      
REVENUES 5,380,526,000us-gaap_SalesRevenueNet 3,975,935,000us-gaap_SalesRevenueNet 2,743,445,000us-gaap_SalesRevenueNet 1,593,937,000us-gaap_SalesRevenueNet 1,385,957,000us-gaap_SalesRevenueNet 1,617,613,000us-gaap_SalesRevenueNet 1,338,208,000us-gaap_SalesRevenueNet 1,135,510,000us-gaap_SalesRevenueNet 326,436,000us-gaap_SalesRevenueNet 9,029,140,000us-gaap_SalesRevenueNet 2,979,894,000us-gaap_SalesRevenueNet 9,699,274,000us-gaap_SalesRevenueNet 4,417,767,000us-gaap_SalesRevenueNet 1,310,473,000us-gaap_SalesRevenueNet    
Operating income 7,770,000us-gaap_OperatingIncomeLoss     9,945,000us-gaap_OperatingIncomeLoss           (12,785,000)us-gaap_OperatingIncomeLoss 2,603,000us-gaap_OperatingIncomeLoss 106,565,000us-gaap_OperatingIncomeLoss 87,307,000us-gaap_OperatingIncomeLoss 15,030,000us-gaap_OperatingIncomeLoss    
Water treatment facilities and equipment | Minimum                                
Estimated fair values of the assets acquired and liabilities assumed                                
Useful life of property, plant and equipment                   3 years   3 years        
Water treatment facilities and equipment | Maximum                                
Estimated fair values of the assets acquired and liabilities assumed                                
Useful life of property, plant and equipment                   30 years   30 years        
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        
Oilfield Water Lines LP                                
Acquisitions                                
Number of common units issued to acquire business (in shares)                       2,463,287us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
    2,463,287us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
 
Period of performance targets as basis for contingent consideration                       6 months        
Potential increase in the purchase price   0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
                  0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
General and administrative expense   800,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
                  800,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
Estimated fair values of the assets acquired and liabilities assumed                                
Accounts receivable - trade 6,837,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
7,268,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
              6,837,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
  7,268,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
Inventories 154,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
154,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
              154,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
  154,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
Prepaid expenses and other current assets 402,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
402,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
              402,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
  402,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
Goodwill 90,144,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
89,699,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
              90,144,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
  89,699,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
Accounts payable - trade (6,469,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
(6,469,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
              (6,469,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
  (6,469,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
Accrued expenses and other payables (992,000)ngl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherPayables
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
(992,000)ngl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherPayables
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
              (992,000)ngl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherPayables
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
  (992,000)ngl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherPayables
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
Other noncurrent liabilities (64,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
(64,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
              (64,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
  (64,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
Fair value of net assets acquired 236,289,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
236,289,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
              236,289,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
  236,289,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
Consideration paid for acquisition                                
Cash paid, net of cash acquired                       167,732,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
    167,700,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
 
Value of common units issued                       68,557,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
    68,600,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
 
Total consideration paid                       236,289,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
REVENUES                       26,200,000us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
Operating income                       900,000us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
       
Oilfield Water Lines LP | Customer relationships                                
Estimated fair values of the assets acquired and liabilities assumed                                
Intangible assets 110,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
110,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
              110,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  110,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
       
Useful life of intangible assets                       10 years        
Oilfield Water Lines LP | Customer relationships | Minimum                                
Estimated fair values of the assets acquired and liabilities assumed                                
Useful life of intangible assets                   8 years            
Oilfield Water Lines LP | Customer relationships | Maximum                                
Estimated fair values of the assets acquired and liabilities assumed                                
Useful life of intangible assets                   10 years            
Oilfield Water Lines LP | Non-compete agreements                                
Estimated fair values of the assets acquired and liabilities assumed                                
Intangible assets 2,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
2,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
              2,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
  2,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
       
Useful life of intangible assets                   3 years   2 years 6 months        
Oilfield Water Lines LP | Land                                
Estimated fair values of the assets acquired and liabilities assumed                                
Property, plant and equipment 710,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
710,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
              710,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
  710,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
       
Oilfield Water Lines LP | Water treatment facilities and equipment                                
Estimated fair values of the assets acquired and liabilities assumed                                
Property, plant and equipment 23,173,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_WaterTreatmentFacilitiesAndEquipmentMember
23,173,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_WaterTreatmentFacilitiesAndEquipmentMember
              23,173,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_WaterTreatmentFacilitiesAndEquipmentMember
  23,173,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_WaterTreatmentFacilitiesAndEquipmentMember
       
Oilfield Water Lines LP | Water treatment facilities and equipment | Minimum                                
Estimated fair values of the assets acquired and liabilities assumed                                
Useful life of property, plant and equipment                   3 years   3 years        
Oilfield Water Lines LP | Water treatment facilities and equipment | Maximum                                
Estimated fair values of the assets acquired and liabilities assumed                                
Useful life of property, plant and equipment                   30 years   30 years        
Oilfield Water Lines LP | Vehicles                                
Estimated fair values of the assets acquired and liabilities assumed                                
Property, plant and equipment 8,143,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
8,157,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
              8,143,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
  8,157,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
       
Oilfield Water Lines LP | Vehicles | Minimum                                
Estimated fair values of the assets acquired and liabilities assumed                                
Useful life of property, plant and equipment                   5 years   5 years        
Oilfield Water Lines LP | Vehicles | Maximum                                
Estimated fair values of the assets acquired and liabilities assumed                                
Useful life of property, plant and equipment                   10 years   10 years        
Oilfield Water Lines LP | Buildings and leasehold improvements                                
Estimated fair values of the assets acquired and liabilities assumed                                
Property, plant and equipment 2,198,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember
2,198,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember
              2,198,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember
  2,198,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember
       
Oilfield Water Lines LP | Buildings and leasehold improvements | Minimum                                
Estimated fair values of the assets acquired and liabilities assumed                                
Useful life of property, plant and equipment                   7 years   7 years        
Oilfield Water Lines LP | 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        
Oilfield Water Lines LP | Other                                
Estimated fair values of the assets acquired and liabilities assumed                                
Property, plant and equipment $ 53,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
$ 53,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
              $ 53,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
  $ 53,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_OilfieldWaterLinesLPMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
       
Oilfield Water Lines LP | Other | Minimum                                
Estimated fair values of the assets acquired and liabilities assumed                                
Useful life of property, plant and equipment                   3 years   3 years        
Oilfield Water Lines LP | Other | Maximum                                
Estimated fair values of the assets acquired and liabilities assumed                                
Useful life of property, plant and equipment                   5 years   5 years