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Offsetting of Financial Assets (Liabilities) and Derivative Assets (liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Net Assets (Liabilities) Presented in the Statement of Financial Position	$ 3,897us-gaap_DerivativeAssetsCurrent	$ 2,342us-gaap_DerivativeAssetsCurrent
Net Assets (Liabilities) Presented in the Statement of Financial Position	(22,891)us-gaap_DerivativeLiabilitiesCurrent	(12,358)us-gaap_DerivativeLiabilitiesCurrent
Subject to an enforceable master netting arrangement
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized	97,822us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	26,263us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Gross Liabilities Offset in the Statement of Financial Position	(116,258)us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	(36,279)us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Assets (Liabilities) Presented in the Statement of Financial Position	(18,436)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	(10,016)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Financial Instruments	0sgu_DerivativeFairValueGrossAmountNotOffsetFinancialInstrumentsNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	0sgu_DerivativeFairValueGrossAmountNotOffsetFinancialInstrumentsNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Cash Collateral Received	0sgu_CashCollateralReceivedFromNotOffsetAgainstDerivativeAssetsAndLiabilities / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	0sgu_CashCollateralReceivedFromNotOffsetAgainstDerivativeAssetsAndLiabilities / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Amount	(18,436)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	(10,016)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Subject to an enforceable master netting arrangement | Fair liability and fair asset value of derivative instruments
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized	76,041us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	23,921us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Gross Liabilities Offset in the Statement of Financial Position	(98,932)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	(36,279)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Assets (Liabilities) Presented in the Statement of Financial Position	(22,891)us-gaap_DerivativeLiabilitiesCurrent / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	(12,358)us-gaap_DerivativeLiabilitiesCurrent / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Financial Instruments	0us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	0us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Cash Collateral Received	0us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	0us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Amount	(22,891)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	(12,358)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_DerivativeFairValueOfDerivativeLiabilityMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Subject to an enforceable master netting arrangement | Fair asset and fair liability value of derivative instruments
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized	20,505us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	2,342us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Gross Liabilities Offset in the Statement of Financial Position	(16,608)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Assets (Liabilities) Presented in the Statement of Financial Position	3,897us-gaap_DerivativeAssetsCurrent / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	2,342us-gaap_DerivativeAssetsCurrent / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Financial Instruments	0us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	0us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Cash Collateral Received	0us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	0us-gaap_DerivativeCollateralObligationToReturnCash / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Amount	3,897us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember	2,342us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_FairAssetAndFairLiabilityValueOfDerivativeInstrumentsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Subject to an enforceable master netting arrangement | Long-term derivative liabilities included in other long-term liabilities balance
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized	340us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Gross Liabilities Offset in the Statement of Financial Position	(430)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Assets (Liabilities) Presented in the Statement of Financial Position	(90)us-gaap_DerivativeLiabilitiesCurrent / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Financial Instruments	0us-gaap_DerivativeCollateralRightToReclaimCash / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Cash Collateral Received	0us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Amount	(90)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeLiabilitiesMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Subject to an enforceable master netting arrangement | Long-term derivative assets included in the deferred charges and other assets, net balance
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gross Assets Recognized	936us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeAssetsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Gross Liabilities Offset in the Statement of Financial Position	(288)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeAssetsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Net Assets (Liabilities) Presented in the Statement of Financial Position	648us-gaap_DerivativeAssetsCurrent / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeAssetsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
Financial Instruments	0us-gaap_DerivativeCollateralObligationToReturnSecurities / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeAssetsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember
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Net Amount	$ 648us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = sgu_LongTermDerivativeAssetsMember / us-gaap_DerivativeByNatureAxis = sgu_SubjectToMasterNettingArrangementMember

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