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Net Income Allocation and Per Unit Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Basic and Diluted Earnings Per Limited Partner: |  |  |  |
Net income | $ 15,554 us-gaap_NetIncomeLoss |  | $ 19,288 us-gaap_NetIncomeLoss |
Less General Partner's interest in net income | 88 us-gaap_NetIncomeLossAllocatedToGeneralPartners |  | 109 us-gaap_NetIncomeLossAllocatedToGeneralPartners |
Net income available to limited partners | 15,466 us-gaap_NetIncomeLossAllocatedToLimitedPartners |  | 19,179 us-gaap_NetIncomeLossAllocatedToLimitedPartners |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260- 10-45-60 | 1,930 sgu_DilutiveImpactOfTheoreticalDistribution |  | 2,665 sgu_DilutiveImpactOfTheoreticalDistribution |
Limited Partner's interest in net income under FASB ASC 260-10-45-60 | $ 13,536 sgu_LimitedPartnersInterestInNetIncomeLossDilutive |  | $ 16,514 sgu_LimitedPartnersInterestInNetIncomeLossDilutive |
Per unit data: |  |  |  |
Basic and diluted net income available to limited partners | 0.27 sgu_IncomeLossFromOperationsPerOutstandingLimitedPartnershipUnitBasicAndDiluted |  | 0.33 sgu_IncomeLossFromOperationsPerOutstandingLimitedPartnershipUnitBasicAndDiluted |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260- 10-45-60 | 0.03 sgu_DilutiveImpactOfTheoreticalDistributionOfEarnings |  | 0.04 sgu_DilutiveImpactOfTheoreticalDistributionOfEarnings |
Limited Partner's interest in net income under FASB ASC 260- 10-45-60 | $ 0.24 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [1] | $ 0.29 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [1]
Weighted average number of Limited Partner units outstanding | 57,294 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted |  | 57,511 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted |
[1] | See Note 12 Earnings Per Limited Partner Unit.

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