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Condensed Consolidating Guarantor and Non-Guarantor Financial Information (Details 5) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
OPERATING ACTIVITIES:          
Net cash provided by (used in) operating activities $ (61,635)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ (48,744)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ 85,236us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ 132,634us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ 90,329us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
INVESTING ACTIVITIES:          
Purchases of long-lived assets (82,851)us-gaap_PaymentsToAcquireProductiveAssets (67,399)us-gaap_PaymentsToAcquireProductiveAssets (165,148)us-gaap_PaymentsToAcquireProductiveAssets (72,475)us-gaap_PaymentsToAcquireProductiveAssets (7,544)us-gaap_PaymentsToAcquireProductiveAssets
Acquisitions of businesses, including acquired working capital, net of cash acquired (658,764)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (392,605)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (1,268,810)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (490,805)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (297,401)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Cash flows from commodity derivatives 4,327us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities (19,074)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities      
Proceeds from sales of assets 8,741us-gaap_ProceedsFromSaleOfProductiveAssets 2,224us-gaap_ProceedsFromSaleOfProductiveAssets 24,660us-gaap_ProceedsFromSaleOfProductiveAssets 5,080us-gaap_ProceedsFromSaleOfProductiveAssets 1,238us-gaap_ProceedsFromSaleOfProductiveAssets
Investments in unconsolidated entities (26,390)us-gaap_PaymentsToAcquireEquityMethodInvestments   (11,515)us-gaap_PaymentsToAcquireEquityMethodInvestments    
Distributions of capital from unconsolidated entities 4,649ngl_ProceedsFromDistributionsOfCapitalOfEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital        
Net cash used in investing activities (750,288)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (476,854)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,455,373)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (546,621)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (296,897)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
FINANCING ACTIVITIES:          
Proceeds from borrowings under revolving credit facilities 1,979,500us-gaap_ProceedsFromLongTermLinesOfCredit 1,061,500us-gaap_ProceedsFromLongTermLinesOfCredit 2,545,500us-gaap_ProceedsFromLongTermLinesOfCredit 1,227,975us-gaap_ProceedsFromLongTermLinesOfCredit 478,900us-gaap_ProceedsFromLongTermLinesOfCredit
Payments on revolving credit facilities (1,804,000)us-gaap_RepaymentsOfLongTermLinesOfCredit (893,000)us-gaap_RepaymentsOfLongTermLinesOfCredit (2,101,000)us-gaap_RepaymentsOfLongTermLinesOfCredit (964,475)us-gaap_RepaymentsOfLongTermLinesOfCredit (329,900)us-gaap_RepaymentsOfLongTermLinesOfCredit
Issuance of notes 400,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt   450,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 250,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt  
Proceeds from borrowings on other long-term debt   880us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt 880us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt 653us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt  
Payments on other long-term debt (4,175)us-gaap_RepaymentsOfOtherLongTermDebt (4,507)us-gaap_RepaymentsOfOtherLongTermDebt (8,819)us-gaap_RepaymentsOfOtherLongTermDebt (4,837)us-gaap_RepaymentsOfOtherLongTermDebt (1,278)us-gaap_RepaymentsOfOtherLongTermDebt
Debt issuance costs (9,198)us-gaap_PaymentsOfDebtIssuanceCosts (2,218)us-gaap_PaymentsOfDebtIssuanceCosts (24,595)us-gaap_PaymentsOfDebtIssuanceCosts (20,189)us-gaap_PaymentsOfDebtIssuanceCosts (2,380)us-gaap_PaymentsOfDebtIssuanceCosts
Contributions 395us-gaap_ProceedsFromPartnershipContribution 2,444us-gaap_ProceedsFromPartnershipContribution 2,825us-gaap_ProceedsFromPartnershipContribution 913us-gaap_ProceedsFromPartnershipContribution 440us-gaap_ProceedsFromPartnershipContribution
Distributions to owners (111,008)ngl_PartnersCapitalAccountDistributionsToOwners (60,623)ngl_PartnersCapitalAccountDistributionsToOwners      
Distributions to noncontrolling interest partners (8,654)ngl_PartnersCapitalAccountDistributionsToNoncontrollingInterestPartners        
Proceeds from sale of common units, net of offering costs 370,446us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits 415,089us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits 650,155us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits (642)us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits 74,759us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits
Net cash provided by financing activities 813,306us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 519,565us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 1,369,016us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 417,716us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 198,063us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents 1,383us-gaap_NetCashProvidedByUsedInContinuingOperations (6,033)us-gaap_NetCashProvidedByUsedInContinuingOperations (1,121)us-gaap_NetCashProvidedByUsedInContinuingOperations 3,729us-gaap_NetCashProvidedByUsedInContinuingOperations (8,505)us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents, beginning of period 10,440us-gaap_CashAndCashEquivalentsAtCarryingValue 11,561us-gaap_CashAndCashEquivalentsAtCarryingValue 11,561us-gaap_CashAndCashEquivalentsAtCarryingValue 7,832us-gaap_CashAndCashEquivalentsAtCarryingValue 16,337us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 11,823us-gaap_CashAndCashEquivalentsAtCarryingValue 5,528us-gaap_CashAndCashEquivalentsAtCarryingValue 10,440us-gaap_CashAndCashEquivalentsAtCarryingValue 11,561us-gaap_CashAndCashEquivalentsAtCarryingValue 7,832us-gaap_CashAndCashEquivalentsAtCarryingValue
Reportable Entity | NGL Energy Partners LP (Parent)          
OPERATING ACTIVITIES:          
Net cash provided by (used in) operating activities (8,180)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(8,312)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(16,625)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(12,428)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
INVESTING ACTIVITIES:          
Acquisitions of businesses, including acquired working capital, net of cash acquired   (334,085)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(334,154)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(452,087)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(291,097)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash used in investing activities   (334,085)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(334,154)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(452,087)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(291,097)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
FINANCING ACTIVITIES:          
Issuance of notes       250,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Debt issuance costs (269)us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(133)us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(645)us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(777)us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Contributions 395us-gaap_ProceedsFromPartnershipContribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
504us-gaap_ProceedsFromPartnershipContribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
765us-gaap_ProceedsFromPartnershipContribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
510us-gaap_ProceedsFromPartnershipContribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Distributions to owners (111,008)ngl_PartnersCapitalAccountDistributionsToOwners
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(60,258)ngl_PartnersCapitalAccountDistributionsToOwners
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
     
Proceeds from sale of common units, net of offering costs 370,446us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
415,089us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
650,155us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(642)us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
74,759us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net changes in advances with consolidated entities (249,724)ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11,459)ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(153,225)ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
286,991ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
238,816ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by financing activities 9,840us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
343,743us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
351,960us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
464,474us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
291,097us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net increase (decrease) in cash and cash equivalents 1,660us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,346us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,181us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(41)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash and cash equivalents, beginning of period 1,181us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
    41us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
41us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, end of period 2,841us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,346us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,181us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  41us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Reportable Entity | NGL Energy Finance Corp          
OPERATING ACTIVITIES:          
Net cash provided by (used in) operating activities (15,383)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
       
FINANCING ACTIVITIES:          
Issuance of notes 400,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
  450,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
   
Debt issuance costs (7,209)us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
  (12,286)us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
   
Net changes in advances with consolidated entities (377,408)ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
  (437,714)ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
   
Net cash provided by financing activities 15,383us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
       
Reportable Entity | Guarantor Subsidiaries          
OPERATING ACTIVITIES:          
Net cash provided by (used in) operating activities (56,019)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(44,607)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
99,754us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
140,794us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
90,477us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
INVESTING ACTIVITIES:          
Purchases of long-lived assets (81,710)us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(37,180)us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(118,455)us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(59,903)us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(6,667)us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Acquisitions of businesses, including acquired working capital, net of cash acquired (657,514)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(56,237)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(932,373)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(38,718)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(6,304)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash flows from commodity derivatives (4,327)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(19,074)us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
     
Proceeds from sales of assets 8,741us-gaap_ProceedsFromSaleOfProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,223us-gaap_ProceedsFromSaleOfProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
12,884us-gaap_ProceedsFromSaleOfProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
5,080us-gaap_ProceedsFromSaleOfProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,238us-gaap_ProceedsFromSaleOfProductiveAssets
/ us-gaap_ConsolidationItemsAxis
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Investments in unconsolidated entities (6,106)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
  (11,515)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Distributions of capital from unconsolidated entities 2,774ngl_ProceedsFromDistributionsOfCapitalOfEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
       
Net cash used in investing activities (729,488)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(110,268)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(1,083,284)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(81,962)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(4,923)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
FINANCING ACTIVITIES:          
Proceeds from borrowings under revolving credit facilities 1,923,500us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
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1,061,500us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,545,500us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,227,975us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
478,900us-gaap_ProceedsFromLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Payments on revolving credit facilities (1,766,000)us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(893,000)us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(2,101,000)us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(964,475)us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(329,900)us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from borrowings on other long-term debt   780us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
780us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
634us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Payments on other long-term debt (4,173)us-gaap_RepaymentsOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(4,499)us-gaap_RepaymentsOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(8,802)us-gaap_RepaymentsOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(4,837)us-gaap_RepaymentsOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(1,278)us-gaap_RepaymentsOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Debt issuance costs (1,720)us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(2,085)us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(11,664)us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(19,412)us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(2,380)us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net changes in advances with consolidated entities 632,995ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(15,123)ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
556,238ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(295,105)ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(239,476)ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash provided by financing activities 784,602us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
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147,573us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
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/ dei_LegalEntityAxis
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981,052us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(55,220)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(94,134)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net increase (decrease) in cash and cash equivalents (905)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(7,302)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(2,478)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,612us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(8,580)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents, beginning of period 8,728us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
11,206us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
11,206us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
7,594us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
16,174us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents, end of period 7,823us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,904us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
8,728us-gaap_CashAndCashEquivalentsAtCarryingValue
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11,206us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
7,594us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Reportable Entity | Non-Guarantor Subsidiaries          
OPERATING ACTIVITIES:          
Net cash provided by (used in) operating activities 17,947us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
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= us-gaap_ReportableLegalEntitiesMember
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= us-gaap_NonGuarantorSubsidiariesMember
4,175us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
2,107us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
4,268us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(148)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
INVESTING ACTIVITIES:          
Purchases of long-lived assets (1,141)us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_ConsolidationItemsAxis
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= us-gaap_NonGuarantorSubsidiariesMember
(30,219)us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(46,693)us-gaap_PaymentsToAcquireProductiveAssets
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(12,572)us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(877)us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Acquisitions of businesses, including acquired working capital, net of cash acquired (1,250)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(2,283)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(2,283)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Proceeds from sales of assets   1us-gaap_ProceedsFromSaleOfProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
11,776us-gaap_ProceedsFromSaleOfProductiveAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Investments in unconsolidated entities (20,284)us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
       
Distributions of capital from unconsolidated entities 1,875ngl_ProceedsFromDistributionsOfCapitalOfEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
       
Net cash used in investing activities (20,800)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(32,501)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(37,935)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(12,572)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(877)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
FINANCING ACTIVITIES:          
Proceeds from borrowings under revolving credit facilities 56,000us-gaap_ProceedsFromLongTermLinesOfCredit
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= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
       
Payments on revolving credit facilities (38,000)us-gaap_RepaymentsOfLongTermLinesOfCredit
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= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
       
Proceeds from borrowings on other long-term debt   100us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
100us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
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= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
19us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Payments on other long-term debt (2)us-gaap_RepaymentsOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(8)us-gaap_RepaymentsOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
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/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(17)us-gaap_RepaymentsOfOtherLongTermDebt
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Contributions   1,940us-gaap_ProceedsFromPartnershipContribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
2,060us-gaap_ProceedsFromPartnershipContribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
403us-gaap_ProceedsFromPartnershipContribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
440us-gaap_ProceedsFromPartnershipContribution
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Distributions to owners   (365)ngl_PartnersCapitalAccountDistributionsToOwners
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
     
Distributions to noncontrolling interest partners (8,654)ngl_PartnersCapitalAccountDistributionsToNoncontrollingInterestPartners
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
       
Net changes in advances with consolidated entities (5,863)ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
26,582ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
34,701ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
8,114ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
660ngl_NetChangeInAdvancesWithConsolidatedEntities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net cash provided by financing activities 3,481us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
28,249us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
36,004us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
8,462us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,100us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net increase (decrease) in cash and cash equivalents 628us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(77)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
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