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Subsequent Events - Additional Information (Detail) (Subsequent Event, USD $) In Millions, except Per Share data, unless otherwise specified | 1 Months Ended
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Jan. 31, 2015
Subsequent Event [Line Items] |
Payment to acquire propane dealership | $ 1.1 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Net working capital credits acquired | 0.1 sgu_BusinessAcquisitionNetWorkingCapitalAcquired
Dividend Declared |
Subsequent Event [Line Items] |
Distribution declared | $ 0.0875 us-gaap_PartnersCapitalDistributionAmountPerShare / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Partners capital projected distribution amount on annualized basis | $ 0.35 sgu_PartnersCapitalProjectedDistributionAmountOnAnnualizedBasisPerShare / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Minimum dividend distribution per unit | $ 0.0675 sgu_MinimumDividendDistributionPerUnit / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Percentage of distributions to common unit holders in excess of minimum quarterly distribution | 90.00%sgu_PercentageOfDistributionsToCommonUnitHoldersInExcessOfMinimumQuarterlyDistribution / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Percentage of distributions to general unit holders in excess of minimum quarterly distribution | 10.00%sgu_PercentageOfDistributionsToGeneralUnitHoldersInExcessOfMinimumQuarterlyDistribution / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Amount to paid to common unit holders | 5.0 us-gaap_LimitedPartnersCapitalAccountDistributionAmount / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Amount to paid to the General Partner | 0.1 us-gaap_GeneralPartnersCapitalAccountDistributionAmount / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Incentive distribution to the General Partner | 0.06 sgu_IncentiveDistributionToGeneralPartner / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Incentive distributions to management | $ 0.06 sgu_IncentiveDistributionsToManagement / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Dividend payable date | Feb. 10, 2015
Dividend record date | Jan. 30, 2015

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- Definition Business Acquisition Net Working Capital Acquired + References No definition available. + Details
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Namespace Prefix: | sgu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Incentive distributions to Management. + References No definition available. + Details
Name: | sgu_IncentiveDistributionsToManagement
Namespace Prefix: | sgu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Incentive distribution to the General Partner. + References No definition available. + Details
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Namespace Prefix: | sgu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Minimum dividend distribution per unit. + References No definition available. + Details
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Namespace Prefix: | sgu_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Partners capital projected distribution amount on annualized basis per share. + References No definition available. + Details
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Namespace Prefix: | sgu_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of distributions to common unit holders in excess of minimum quarterly distribution. + References No definition available. + Details
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Namespace Prefix: | sgu_
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of distributions to general unit holders in excess of minimum quarterly distribution. + References No definition available. + Details
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Namespace Prefix: | sgu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of distributions to the general partner during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The total amount of distributions to limited partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The distribution amount per share for all classes of units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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Balance Type: | na
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Period Type: | duration