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

Represents the amount 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_UnrecordedUnconditionalObligationOutstandingFixedPriceSalesContractsVolume
Namespace Prefix:	ngl_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

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

Represents the volume of natural gas liquids and crude oil supplies dedicated or contracted to the enterprise that can be used to fulfill existing contracts or agreements at an index price.

No definition available.

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

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

No definition available.

Name:	ngl_UnrecordedUnconditionalPurchaseObligationOutstandingFixedPricePurchaseContracts
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 purchase obligation that has not been recognized for financial reporting purposes.

No definition available.

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

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

No definition available.

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

Represents the volume of crude oil supplies in connection with an unconditional index-price purchase obligation that has not been recognized for financial reporting purposes.

No definition available.

Name:	ngl_UnrecordedUnconditionalPurchaseObligationOutstandingIndexPricePurchaseContractsOfVolume1
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 purchase obligation that has not been recognized for financial reporting purposes.

No definition available.

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

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_BalanceSheetLocationAxis=ngl_AccruedExpensesAndOtherPayablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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