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Common Unit Repurchase and Retirement - Additional Information (Detail) (USD $) In Millions, unless otherwise specified		6 Months Ended
	Jul. 31, 2012	Mar. 31, 2013 First Amendment
Capital Unit [Line Items]
Partnership's common units authorized for repurchase	3.0
Availability required to pay distributions		$ 61.3
Percentage of the maximum facility size on a historical proforma and forward-looking basis		17.50%
Minimum fixed charge coverage ratio to repurchase common units		1.15

X

- Definition

Availability required to pay distributions or repurchase common units.

+ References

No definition available.

+ Details

Name:	sgu_AvailabilityRequiredToPayDistributionsOrRepurchaseCommonUnits
Namespace Prefix:	sgu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Minimum fixed charge coverage ratio to repurchase common units

+ References

No definition available.

+ Details

Name:	sgu_MinimumFixedChargeCoverageRatioToRepurchaseCommonUnits
Namespace Prefix:	sgu_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Minimum percentage of borrowing capacity to pay any distributions to unitholders or repurchase common units.

+ References

No definition available.

+ Details

Name:	sgu_MinimumPercentageOfBorrowingCapacityToPayAnyDistributionsToUnitholdersOrRepurchaseCommonUnits
Namespace Prefix:	sgu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant