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SUBSEQUENT EVENTS -Additional Information (Details) (USD $)	0 Months Ended
	Mar. 11, 2013	May 02, 2012	Sep. 27, 2011	Feb. 24, 2009
Subsequent Event [Line Items]
Loss Contingencies Penalties	$ 150,000	$ 250,000	$ 22,000,000	$ 125,000
Loss Contingencies Penalties Suspended	100,000
Loss Contingencies Disgorgement	300,000		6,600,000
Loss Contingencies Restitution		2,900,000
Loss Contingency prejudgment Damages Awarded Value			$ 1,800,000

X

- Definition

Amount of forced giving up of profits obtained by illegal or unethical acts

+ References

No definition available.

+ Details

Name:	unl_lossContingenciesDisgorgement
Namespace Prefix:	unl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of penalty paid during the period

+ References

No definition available.

+ Details

Name:	unl_LossContingenciesPenalties
Namespace Prefix:	unl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of penalty suspended during the period.

+ References

No definition available.

+ Details

Name:	unl_LossContingenciesPenaltiesSuspended
Namespace Prefix:	unl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount paid for restitution during the period

+ References

No definition available.

+ Details

Name:	unl_LossContingenciesResitution
Namespace Prefix:	unl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of prejudgment damages awarded to the plaintiff in the legal matter

+ References

No definition available.

+ Details

Name:	unl_LossContingencyPrejudgmentDamagesAwardedValue
Namespace Prefix:	unl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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