Name:	ngl_FixedPriceSaleCommitments
Namespace Prefix:	ngl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the volume of natural gas liquids and crude oil supplies in connection with an unconditional fixed-price sale that has not been recognized for financial reporting purposes.

No definition available.

Name:	ngl_FixedPriceSaleCommitmentsinbarrelsgallons
Namespace Prefix:	ngl_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

Fixed-price sale commitments (in gallons), due in second year

No definition available.

Name:	ngl_FixedPriceSaleCommitmentsingallonsDueinSecondYear
Namespace Prefix:	ngl_
Data Type:	num:volumeItemType
Balance Type:	na
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Fixed-price sale commitments (in gallons), due in third year

No definition available.

Name:	ngl_FixedPriceSaleCommitmentsingallonsDueinThirdYear
Namespace Prefix:	ngl_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

Fixed-price sales commitments, due in next twelve months

No definition available.

Name:	ngl_FixedPriceSalesCommitmentsDueinNextTwelveMonths
Namespace Prefix:	ngl_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

Index-Price Sale Commitments, Due in Next Twelve Months

No definition available.

Name:	ngl_IndexPriceSaleCommitmentsDueinNextTwelveMonths
Namespace Prefix:	ngl_
Data Type:	num:volumeItemType
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Unrecorded Unconditional Obligation Fixed-price sales contracts, due in second year

No definition available.

Name:	ngl_UnrecordedUnconditionalObligationFixedPriceSalesContractsDueinSecondYear
Namespace Prefix:	ngl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Unrecorded Unconditional Obligation Outstanding Fixed Price Sales Contracts, Due in Next Twelve Months

No definition available.

Name:	ngl_UnrecordedUnconditionalObligationOutstandingFixedPriceSalesContractsDueinNextTwelveMonths
Namespace Prefix:	ngl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Unrecorded Unconditional Obligation Outstanding Fixed-Price Sales Contracts, due in third year

No definition available.

Name:	ngl_UnrecordedUnconditionalObligationOutstandingFixedPriceSalesContractsDueinThirdYear
Namespace Prefix:	ngl_
Data Type:	xbrli:monetaryItemType
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Represents the amount of natural gas liquids and crude oil supplies in connection with an unconditional index-price sale that has not been recognized for financial reporting purposes.

No definition available.

Name:	ngl_UnrecordedUnconditionalObligationOutstandingIndexPriceSalesContracts
Namespace Prefix:	ngl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Unrecorded Unconditional Obligation Outstanding Index Price Sales Contracts, in Next Twelve Months

No definition available.

Name:	ngl_UnrecordedUnconditionalObligationOutstandingIndexPriceSalesContractsDueinNextTwelveMonths
Namespace Prefix:	ngl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Unrecorded Unconditional Obligation Outstanding Index Price Sales Contracts, due in second year

No definition available.

Name:	ngl_UnrecordedUnconditionalObligationOutstandingIndexPriceSalesContractsDueinSecondYear
Namespace Prefix:	ngl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Unrecorded Unconditional Obligation Outstanding Index Price Sales Contracts, Due in the second year

No definition available.

Name:	ngl_UnrecordedUnconditionalObligationOutstandingIndexPriceSalesContractsDueintheSecondYear
Namespace Prefix:	ngl_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

Represents the volume of natural gas liquids and crude oil supplies in connection with an unconditional index-price sale that has not been recognized for financial reporting purposes.

No definition available.

Name:	ngl_UnrecordedUnconditionalObligationOutstandingIndexPriceSalesContractsVolume
Namespace Prefix:	ngl_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

[Line Items] for Unrecorded Unconditional Sales Obligation [Table]

No definition available.

Name:	ngl_UnrecordedUnconditionalSalesObligationLineItems
Namespace Prefix:	ngl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Fair value of the assets less the liabilities of a derivative or group of derivatives.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

Name:	us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=srt_CrudeOilMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=ngl_NaturalGasLiquidsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
Namespace Prefix:
Data Type:	na
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