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

- Details

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

- Definition

Represents the number of terminals owned by the entity.

+ References

No definition available.

+ Details

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

- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Organization and Operations (Details) (USD $) In Thousands, unless otherwise specified				1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2013 Retail propane and distillate operations item	Jun. 30, 2013 Retail propane and distillate operations Minimum item	Nov. 01, 2011 SemStream item	Jan. 31, 2012 Pacer Propane Holdings, L.P. item	Jun. 30, 2013 Retail propane operations item	Mar. 31, 2012 Retail propane operations item	Mar. 31, 2013 Retail and distillate operations acquisitions item	Mar. 31, 2013 Acquisitions to expand assets and operations of the entity's crude oil item
Acquisitions Subsequent to Initial Public Offering
Number of acquired natural gas liquids terminals			12
Number of companies associated with acquiree entity				7
Number of business combination transactions					2	3	6	4
Purchase price								$ 64,985
Number of owned terminals	17
Number of states in which entity operates		20