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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 | 6 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Basic and Diluted Earnings Per Limited Partner: |  |  |  |  |  |  |  |
Net income | $ 75,687 us-gaap_NetIncomeLoss |  | $ 52,216 us-gaap_NetIncomeLoss |  | $ 91,241 us-gaap_NetIncomeLoss |  | $ 71,504 us-gaap_NetIncomeLoss |
Less General Partner's interest in net income | 428 us-gaap_NetIncomeLossAllocatedToGeneralPartners |  | 294 us-gaap_NetIncomeLossAllocatedToGeneralPartners |  | 516 us-gaap_NetIncomeLossAllocatedToGeneralPartners |  | 403 us-gaap_NetIncomeLossAllocatedToGeneralPartners |
Net income available to limited partners | 75,259 us-gaap_NetIncomeLossAllocatedToLimitedPartners |  | 51,922 us-gaap_NetIncomeLossAllocatedToLimitedPartners |  | 90,725 us-gaap_NetIncomeLossAllocatedToLimitedPartners |  | 71,101 us-gaap_NetIncomeLossAllocatedToLimitedPartners |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 | 13,616 sgu_DilutiveImpactOfTheoreticalDistribution |  | 9,065 sgu_DilutiveImpactOfTheoreticalDistribution |  | 15,705 sgu_DilutiveImpactOfTheoreticalDistribution |  | 11,922 sgu_DilutiveImpactOfTheoreticalDistribution |
Limited Partner's interest in net income under FASB ASC 260-10-45-60 | $ 61,643 sgu_LimitedPartnersInterestInNetIncomeLossDilutive |  | $ 42,857 sgu_LimitedPartnersInterestInNetIncomeLossDilutive |  | $ 75,020 sgu_LimitedPartnersInterestInNetIncomeLossDilutive |  | $ 59,179 sgu_LimitedPartnersInterestInNetIncomeLossDilutive |
Per unit data: |  |  |  |  |  |  |  |
Basic and diluted net income available to limited partners | 1.31 sgu_IncomeLossFromOperationsPerOutstandingLimitedPartnershipUnitBasicAndDiluted |  | 0.90 sgu_IncomeLossFromOperationsPerOutstandingLimitedPartnershipUnitBasicAndDiluted |  | 1.58 sgu_IncomeLossFromOperationsPerOutstandingLimitedPartnershipUnitBasicAndDiluted |  | 1.24 sgu_IncomeLossFromOperationsPerOutstandingLimitedPartnershipUnitBasicAndDiluted |
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60 | 0.23 sgu_DilutiveImpactOfTheoreticalDistributionOfEarnings |  | 0.15 sgu_DilutiveImpactOfTheoreticalDistributionOfEarnings |  | 0.27 sgu_DilutiveImpactOfTheoreticalDistributionOfEarnings |  | 0.21 sgu_DilutiveImpactOfTheoreticalDistributionOfEarnings |
Limited Partner's interest in net income under FASB ASC 260-10-45-60 | $ 1.08 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [1] | $ 0.75 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [1] | $ 1.31 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [1] | $ 1.03 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [1]
Weighted average number of Limited Partner units outstanding | 57,282 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted |  | 57,468 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted |  | 57,288 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted |  | 57,490 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted |
[1] | See Note 13 Earnings Per Limited Partner Unit.

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