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Common Unit Repurchase and Retirement - Additional Information (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 0 Months Ended |  |  |
--- | --- | --- | --- | ---
Jan. 14, 2014 | Mar. 31, 2015 | Jul. 31, 2012 | Jul. 31, 2013
Capital Unit [Line Items] |  |  |  |
Partnership's common units authorized for repurchase |  | 6,044 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |
Second Amendment |  |  |  |
Capital Unit [Line Items] |  |  |  |
Availability required to repurchase common units | $ 45 sgu_AvailabilityRequiredToPayDistributionsOrRepurchaseCommonUnits / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |  |  |
Percentage of the maximum facility size on a historical proforma and forward-looking basis | 15.00%sgu_MinimumPercentageOfBorrowingCapacityToPayAnyDistributionsToUnitholdersOrRepurchaseCommonUnits / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |  |  |
Non Seasonal maximum borrowing capacity under revolving credit facility | $ 300 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |  |  |
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units | 115.00%sgu_MinimumFixedChargeCoverageRatioForDistributionsToUnitholdersOrRepurchaseCommonUnits / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |  |  |
Initial Common Units Authorized Plan III Common Units Repurchase Program |  |  |  |
Capital Unit [Line Items] |  |  |  |
Partnership's common units authorized for repurchase |  |  | 3,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = sgu_CommonStockRepurchaseProgramMember |
Additional Common Units Authorized Plan III Common Units Repurchase Program |  |  |  |
Capital Unit [Line Items] |  |  |  |
Partnership's common units authorized for repurchase |  |  |  | 1,900 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = sgu_StockRepurchaseProgramAdditionalAuthorizationMember

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- 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

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- Definition Minimum Fixed Charge Coverage Ratio For Distributions To Unitholders Or Repurchase Common Units + References No definition available. + Details
Name: | sgu_MinimumFixedChargeCoverageRatioForDistributionsToUnitholdersOrRepurchaseCommonUnits
Namespace Prefix: | sgu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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

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

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=sgu_CommonStockRepurchaseProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=sgu_StockRepurchaseProgramAdditionalAuthorizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |