Represents the number of natural gas liquids terminals acquired by the entity in a business combination.

No definition available.

Name:	ngl_BusinessAcquisitionNumberOfAcquiredNaturalGasLiquidsTerminals
Namespace Prefix:	ngl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of companies associated with the acquiree entity.

+ References

No definition available.

+ Details

Name:	ngl_BusinessAcquisitionNumberOfCompaniesAssociatedWithAcquiree
Namespace Prefix:	ngl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of crude oil barges acquired in a business combination.

+ References

No definition available.

+ Details

Name:	ngl_BusinessAcquisitionNumberOfCrudeOilBargesAcquired
Namespace Prefix:	ngl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of tow boats acquired in business combination.

+ References

No definition available.

+ Details

Name:	ngl_BusinessAcquisitionNumberOfTowBoatsAcquired
Namespace Prefix:	ngl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of water disposal facilities acquired in a business combination.

+ References

No definition available.

+ Details

Name:	ngl_BusinessAcquisitionNumberOfWaterDisposalFacilitiesAcquired
Namespace Prefix:	ngl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ngl_CoastalPlainsDisposal1LLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ngl_CrescentTerminalsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ngl_GavilonLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ngl_HighRollerWellsBigLakeSWDNo1LtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ngl_OilfieldWaterLinesLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ngl_PacerPropaneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ngl_SemStreamLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Nature of Operations and Organization (Details 2)	1 Months Ended
Nature of Operations and Organization (Details 2)	Jan. 31, 2012 item	Aug. 31, 2013 item	Mar. 31, 2014	Nov. 01, 2011 item	Jul. 31, 2013 item	Dec. 02, 2013	Dec. 31, 2013
Acquisitions Subsequent to Initial Public Offering
Equity method ownership interest (as a percent)			50.00%
SemStream
Acquisitions Subsequent to Initial Public Offering
Number of acquired natural gas liquids terminals				12
Pacer
Acquisitions Subsequent to Initial Public Offering
Number of companies associated with the acquiree entity	7
Crescent Terminals, LLC
Acquisitions Subsequent to Initial Public Offering
Number of tow boats acquired					4
Number of crude oil barges acquired					7
Big Lake
Acquisitions Subsequent to Initial Public Offering
Number of water disposal facilities acquired			1
Oilfield Water Lines LP
Acquisitions Subsequent to Initial Public Offering
Number of companies associated with the acquiree entity		7
Coastal
Acquisitions Subsequent to Initial Public Offering
Number of water disposal facilities acquired			1
Gavilon Energy
Acquisitions Subsequent to Initial Public Offering
Equity method ownership interest (as a percent)						11.00%
Gavilon Energy \| Glass Mountain
Acquisitions Subsequent to Initial Public Offering
Equity method ownership interest (as a percent)						50.00%	50.00%