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Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 14, 2014 | Dec. 31, 2014 | Sep. 30, 2014
Debt Instrument [Line Items] |  |  |
Hedging positions and payable amounts secured under credit facility |  | $ 28,700,000 us-gaap_DerivativeAmountOfHedgedItem | $ 14,900,000 us-gaap_DerivativeAmountOfHedgedItem
Letters of credit issued |  | 55,300,000 us-gaap_LettersOfCreditOutstandingAmount | 52,800,000 us-gaap_LettersOfCreditOutstandingAmount
Availability in compliance with the fixed charge coverage ratio |  | 181,700,000 sgu_AvailabilityInComplianceWithFixedChargeCoverageRatio | 149,600,000 sgu_AvailabilityInComplianceWithFixedChargeCoverageRatio
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility outstanding |  | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Second Amendment |  |  |
Debt Instrument [Line Items] |  |  |
Non Seasonal maximum borrowing capacity under revolving credit facility | 300,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember | 300,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Maximum borrowing capacity (heating season December to April) under revolving credit facility |  | 450,000,000 sgu_LineOfCreditFacilityMaximumBorrowingCapacityDuringHeatingSeason / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Issuance of line of credit for working capital purposes |  | 100,000,000 sgu_LineOfCreditFacilityAdditionalBorrowingCapacityForWorkingCapitalNeeds / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Alternate revolving credit facility expiry |  | Jan. 14, 2019 |
Revolving credit facility expiry |  | Jun. 01, 2017 |
Additional revolving credit |  | 100,000,000 sgu_LineOfCreditFacilityIncreaseAdditionalBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Facility size that can be increased without consulting bank group |  | 100,000,000 sgu_MaximumIncreaseAllowedWithoutBankConsulting / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Line of credit facility description |  | All outstanding amounts owed under the second amended and restated credit facility become due and payable on the facility termination date of June 1, 2017. If the Partnership has repaid, prepaid or otherwise defeased at least $100 million of our 8.875% Senior Notes and Availability is equal to or greater than the aggregate amount required to repay the remaining outstanding 8.875% Senior Notes (“Payoff Amount”), then the facility termination date is January 14, 2019. |
Description of variable rate |  | The interest rate on the second amended and restated credit facility is LIBOR plus (i) 1.75% (if Availability, as defined in the agreement is greater than or equal to $150 million), or (ii) 2.00% (if Availability is greater than $75 million but less than $150 million), or (iii) 2.25% (if Availability is less than or equal to $75 million). The Commitment Fee on the unused portion of the facility is 0.30% per annum. |
Condition one, additional interest rate based on LIBOR |  | 1.75%sgu_ConditionOneAdditionalInterestRateBasedOnLibor / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Condition two, additional interest rate based on LIBOR |  | 2.00%sgu_ConditionTwoAdditionalInterestRateBasedOnLibor / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Condition three, additional interest rate based on LIBOR |  | 2.25%sgu_ConditionThreeAdditionalInterestRateBasedOnLibor / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Minimum availability, condition one |  | 150,000,000 sgu_MinimumAvailabilityConditionOne / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Maximum availability, condition two |  | 150,000,000 sgu_MaximumAvailabilityConditionTwo / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Minimum availability, condition two |  | 75,000,000 sgu_MinimumAvailabilityConditionTwo / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Maximum availability, condition three |  | 75,000,000 sgu_MaximumAvailabilityConditionThree / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Commitment fee on the unused portion of the facility |  | 0.30%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Availability percentage to maximum facility size |  | 12.50%sgu_AvailabilityPercentageToMaximumFacilitySize / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Minimum fixed charge coverage ratio |  | 110.00%sgu_MinimumFixedChargeCoverageRatioOnRevolvingCreditFacilities / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Availability required to make acquisition |  | 40,000,000 sgu_AvailabilityRequiredToMakeAcquisition / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
Availability required to pay distributions | 45,000,000 sgu_AvailabilityRequiredToPayDistributionsOrRepurchaseCommonUnits / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember | 45,000,000 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 | 15.00%sgu_MinimumPercentageOfBorrowingCapacityToPayAnyDistributionsToUnitholdersOrRepurchaseCommonUnits / 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 | 115.00%sgu_MinimumFixedChargeCoverageRatioForDistributionsToUnitholdersOrRepurchaseCommonUnits / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember |
8.875% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest accrued by public notes for each year |  | 8.875%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = sgu_EightPointEightSevenFivePercentSeniorNotesMember |
8.875% Senior Notes | Second Amendment |  |  |
Debt Instrument [Line Items] |  |  |
Amount required to repaid, prepaid or defeased |  | $ 100,000,000 sgu_MinimumDebtRequiredToBeRepaidPrepaidOrOtherwiseDefeaseToExtendFacilityTerminationDate / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember / us-gaap_LongtermDebtTypeAxis = sgu_EightPointEightSevenFivePercentSeniorNotesMember |
Interest accrued by public notes for each year |  | 8.875%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_LineOfCreditFacilityAxis = sgu_SecondAmendmentMember / us-gaap_LongtermDebtTypeAxis = sgu_EightPointEightSevenFivePercentSeniorNotesMember |

X
- Definition Availability in compliance with the fixed charge coverage ratio. + References No definition available. + Details
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- Definition Availability percentage to maximum facility size. + References No definition available. + Details
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- Definition Availability required to make acquisition. + References No definition available. + Details
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- Definition Availability required to pay distributions or repurchase common units. + References No definition available. + Details
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X
- Definition Condition One, Additional Interest rate Based on Libor + References No definition available. + Details
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- Definition Condition Three, Additional Interest rate Based on Libor + References No definition available. + Details
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- Definition Condition Two, Additional Interest rate Based on Libor + References No definition available. + Details
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- Definition Line Of Credit Facility Additional Borrowing Capacity For Working Capital Needs + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line Of Credit Facility Increase Additional Borrowing Capacity + References No definition available. + Details
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Balance Type: | credit
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- Definition Line Of Credit Facility Initial Expiration Date + References No definition available. + Details
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- Definition Line of credit facility maximum borrowing capacity during the heating season. + References No definition available. + Details
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- Definition Maximum Availability, Condition Three + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Maximum Availability, Condition Two + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Maximum increase allowed without bank consulting. + References No definition available. + Details
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Balance Type: | credit
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- Definition Minimum Availability, Condition One + References No definition available. + Details
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Period Type: | instant

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- Definition Minimum Availability, Condition Two + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum Debt Required to be Repaid Prepaid or Otherwise Defease to Extend Facility Termination Date + References No definition available. + Details
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- Definition Minimum Fixed Charge Coverage Ratio For Distributions To Unitholders Or Repurchase Common Units + References No definition available. + Details
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- Definition Minimum Fixed Charge Coverage Ratio On Revolving Credit Facilities + References No definition available. + Details
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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
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity. + 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
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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
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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
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Balance Type: | credit
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Details
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- Details
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- Details
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