<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Version>2.4.0.8</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>131</ContextCount>
  <ElementCount>273</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>49</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>101 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DocumentandEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>103 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/StatementOfFinancialPositionClassified</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>104 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/StatementOfFinancialPositionClassifiedParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>105 - Statement - Condensed Consolidated Statements Of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/StatementOfIncomeAlternative</Role>
      <ShortName>Condensed Consolidated Statements Of Operations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>106 - Statement - Condensed Consolidated Statements Of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/StatementOfOtherComprehensiveIncome</Role>
      <ShortName>Condensed Consolidated Statements Of Comprehensive Income</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>107 - Statement - Condensed Consolidated Statement Of Partners' Capital</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/StatementOfPartnersCapital</Role>
      <ShortName>Condensed Consolidated Statement Of Partners' Capital</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>108 - Statement - Condensed Consolidated Statements Of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/StatementOfCashFlowsIndirect</Role>
      <ShortName>Condensed Consolidated Statements Of Cash Flows</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>109 - Statement - Condensed Consolidated Statements Of Cash Flows (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/StatementOfCashFlowsIndirectParenthetical</Role>
      <ShortName>Condensed Consolidated Statements Of Cash Flows (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>110 - Disclosure - Partnership Organization</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock</Role>
      <ShortName>Partnership Organization</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>111 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlock</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>112 - Disclosure - Common Unit Repurchase and Retirement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsPartnersCapitalNotesDisclosureTextBlock</Role>
      <ShortName>Common Unit Repurchase and Retirement</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>113 - Disclosure - Derivatives and Hedging-Fair Value Measurements and Accounting for the Offsetting of Certain Contracts</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock</Role>
      <ShortName>Derivatives and Hedging-Fair Value Measurements and Accounting for the Offsetting of Certain Contracts</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>114 - Disclosure - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsInventoryDisclosureTextBlock</Role>
      <ShortName>Inventories</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>115 - Disclosure - Property and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlock</Role>
      <ShortName>Property and Equipment</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>116 - Disclosure - Business Combination</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock</Role>
      <ShortName>Business Combination</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>117 - Disclosure - Goodwill and Intangibles, net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock</Role>
      <ShortName>Goodwill and Intangibles, net</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>118 - Disclosure - Long-Term Debt and Bank Facility Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock</Role>
      <ShortName>Long-Term Debt and Bank Facility Borrowings</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>119 - Disclosure - Employee Benefit Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsPensionAndOtherPostretirementBenefitsDisclosureTextBlock</Role>
      <ShortName>Employee Benefit Plan</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>120 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock</Role>
      <ShortName>Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>121 - Disclosure - Supplemental Disclosure of Cash Flow Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsCashFlowSupplementalDisclosuresTextBlock</Role>
      <ShortName>Supplemental Disclosure of Cash Flow Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>122 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock</Role>
      <ShortName>Commitments and Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>123 - Disclosure - Earnings (Loss) Per Limited Partner Unit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock</Role>
      <ShortName>Earnings (Loss) Per Limited Partner Unit</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>124 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsSubsequentEventsTextBlock</Role>
      <ShortName>Subsequent Events</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>125 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlockPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>126 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlockTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>127 - Disclosure - Common Unit Repurchase and Retirement (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsPartnersCapitalNotesDisclosureTextBlockTables</Role>
      <ShortName>Common Unit Repurchase and Retirement (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>128 - Disclosure - Derivatives and Hedging-Fair Value Measurements and Accounting for the Offsetting of Certain Contracts (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlockTables</Role>
      <ShortName>Derivatives and Hedging-Fair Value Measurements and Accounting for the Offsetting of Certain Contracts (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>129 - Disclosure - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsInventoryDisclosureTextBlockTables</Role>
      <ShortName>Inventories (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>130 - Disclosure - Property and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlockTables</Role>
      <ShortName>Property and Equipment (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>131 - Disclosure - Business Combination (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlockTables</Role>
      <ShortName>Business Combination (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>132 - Disclosure - Goodwill and Intangibles, net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlockTables</Role>
      <ShortName>Goodwill and Intangibles, net (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>133 - Disclosure - Long-Term Debt and Bank Facility Borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlockTables</Role>
      <ShortName>Long-Term Debt and Bank Facility Borrowings (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>134 - Disclosure - Employee Benefit Plan (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsPensionAndOtherPostretirementBenefitsDisclosureTextBlockTables</Role>
      <ShortName>Employee Benefit Plan (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>135 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlockTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>136 - Disclosure - Supplemental Disclosure of Cash Flow Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsCashFlowSupplementalDisclosuresTextBlockTables</Role>
      <ShortName>Supplemental Disclosure of Cash Flow Information (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>137 - Disclosure - Earnings (Loss) Per Limited Partner Unit (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlockTables</Role>
      <ShortName>Earnings (Loss) Per Limited Partner Unit (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>138 - Disclosure - Partnership Organization - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosurePartnershipOrganizationAdditionalInformation</Role>
      <ShortName>Partnership Organization - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>139 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformation</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>140 - Disclosure - Components of Interest Expense, Net (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureComponentsOfInterestExpenseNet</Role>
      <ShortName>Components of Interest Expense, Net (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>141 - Disclosure - Common Unit Repurchase and Retirement - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureCommonUnitRepurchaseAndRetirementAdditionalInformation</Role>
      <ShortName>Common Unit Repurchase and Retirement - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>142 - Disclosure - Partnership's Repurchase Activities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosurePartnershipsRepurchaseActivities</Role>
      <ShortName>Partnership's Repurchase Activities (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>143 - Disclosure - Partnership's Repurchase Activities (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosurePartnershipsRepurchaseActivitiesParenthetical</Role>
      <ShortName>Partnership's Repurchase Activities (Parenthetical) (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>144 - Disclosure - Derivatives and Hedging-Fair Value Measurements and Accounting for the Offsetting of Certain Contracts - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureDerivativesAndHedgingFairValueMeasurementsAndAccountingForTheOffsettingOfCertainContractsAdditionalInformation</Role>
      <ShortName>Derivatives and Hedging-Fair Value Measurements and Accounting for the Offsetting of Certain Contracts - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>145 - Disclosure - Partnership's Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosurePartnershipsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis</Role>
      <ShortName>Partnership's Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>146 - Disclosure - Offsetting of Financial Assets (Liabilities) and Derivative Assets (liabilities) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureOffsettingOfFinancialAssetsLiabilitiesAndDerivativeAssetsliabilities</Role>
      <ShortName>Offsetting of Financial Assets (Liabilities) and Derivative Assets (liabilities) (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>147 - Disclosure - Effect of Derivative Instruments on Statement of Operations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureEffectOfDerivativeInstrumentsOnStatementOfOperations</Role>
      <ShortName>Effect of Derivative Instruments on Statement of Operations (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>148 - Disclosure - Components of Inventory (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureComponentsOfInventory</Role>
      <ShortName>Components of Inventory (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>149 - Disclosure - Component of Property and Equipment and their Estimated Useful Lives (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureComponentOfPropertyAndEquipmentAndTheirEstimatedUsefulLives</Role>
      <ShortName>Component of Property and Equipment and their Estimated Useful Lives (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>150 - Disclosure - Business Combinations - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureBusinessCombinationsAdditionalInformation</Role>
      <ShortName>Business Combinations - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>151 - Disclosure - Summary of Preliminary Fair Values and Purchase Price Allocation at Acquisition Date of Assets Acquired and Liabilities Assumed (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureSummaryOfPreliminaryFairValuesAndPurchasePriceAllocationAtAcquisitionDateOfAssetsAcquiredAndLiabilitiesAssumed</Role>
      <ShortName>Summary of Preliminary Fair Values and Purchase Price Allocation at Acquisition Date of Assets Acquired and Liabilities Assumed (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>152 - Disclosure - Summary of Preliminary Fair Values and Purchase Price Allocation at Acquisition Date of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureSummaryOfPreliminaryFairValuesAndPurchasePriceAllocationAtAcquisitionDateOfAssetsAcquiredAndLiabilitiesAssumedParenthetical</Role>
      <ShortName>Summary of Preliminary Fair Values and Purchase Price Allocation at Acquisition Date of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>153 - Disclosure - Unaudited Pro Forma Results of Operations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureUnauditedProFormaResultsOfOperations</Role>
      <ShortName>Unaudited Pro Forma Results of Operations (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>154 - Disclosure - Summary of Changes in the Partnership's Goodwill (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureSummaryOfChangesInThePartnershipsGoodwill</Role>
      <ShortName>Summary of Changes in the Partnership's Goodwill (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>155 - Disclosure - Intangible Assets Subject to Amortization (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureIntangibleAssetsSubjectToAmortization</Role>
      <ShortName>Intangible Assets Subject to Amortization (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>156 - Disclosure - Other Intangible Assets - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureOtherIntangibleAssetsAdditionalInformation</Role>
      <ShortName>Other Intangible Assets - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>157 - Disclosure - Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureEstimatedAnnualAmortizationExpenseRelatedToIntangibleAssetsSubjectToAmortization</Role>
      <ShortName>Estimated Annual Amortization Expense Related to Intangible Assets Subject to Amortization (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>158 - Disclosure - Partnership's Debt (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosurePartnershipsDebt</Role>
      <ShortName>Partnership's Debt (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>159 - Disclosure - Partnership's Debt (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosurePartnershipsDebtParenthetical</Role>
      <ShortName>Partnership's Debt (Parenthetical) (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>160 - Disclosure - Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureLongTermDebtAndBankFacilityBorrowingsAdditionalInformation</Role>
      <ShortName>Long-Term Debt and Bank Facility Borrowings - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>161 - Disclosure - Net Periodic Benefit Cost (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureNetPeriodicBenefitCost</Role>
      <ShortName>Net Periodic Benefit Cost (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>162 - Disclosure - Employee Benefit Plan - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureEmployeeBenefitPlanAdditionalInformation</Role>
      <ShortName>Employee Benefit Plan - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>163 - Disclosure - Current and Deferred Income Tax Expense (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureCurrentAndDeferredIncomeTaxExpense</Role>
      <ShortName>Current and Deferred Income Tax Expense (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>164 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureIncomeTaxesAdditionalInformation</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>165 - Disclosure - Supplemental Disclosure of Cash Flow Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureSupplementalDisclosureOfCashFlowInformation</Role>
      <ShortName>Supplemental Disclosure of Cash Flow Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>166 - Disclosure - Supplemental Disclosure of Cash Flow Information (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureSupplementalDisclosureOfCashFlowInformationParenthetical</Role>
      <ShortName>Supplemental Disclosure of Cash Flow Information (Parenthetical) (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>167 - Disclosure - Net Income Allocation and Per Unit Data (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureNetIncomeAllocationAndPerUnitData</Role>
      <ShortName>Net Income Allocation and Per Unit Data (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>168 - Disclosure - Subsequent Events - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.star-gas.com/taxonomy/role/DisclosureSubsequentEventsAdditionalInformation</Role>
      <ShortName>Subsequent Events - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Element us-gaap_CashAcquiredFromAcquisition had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_LongTermDebt had a mix of decimals attribute values: -6 -3.</Log>
    <Log type="Info">Element us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased had a mix of decimals attribute values: -5 -4 -3.</Log>
    <Log type="Info">'Monetary' elements on report '150 - Disclosure - Business Combinations - Additional Information (Detail)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 103 - Statement - Condensed Consolidated Balance Sheets</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Mar. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2012'</Log>
    <Log type="Info">Process Flow-Through: 104 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 105 - Statement - Condensed Consolidated Statements Of Operations</Log>
    <Log type="Info">Process Flow-Through: 106 - Statement - Condensed Consolidated Statements Of Comprehensive Income</Log>
    <Log type="Info">Process Flow-Through: 108 - Statement - Condensed Consolidated Statements Of Cash Flows</Log>
    <Log type="Info">Process Flow-Through: 109 - Statement - Condensed Consolidated Statements Of Cash Flows (Parenthetical)</Log>
  </Logs>
  <InputFiles>
    <File>sgu-20140331.xml</File>
    <File>sgu-20140331.xsd</File>
    <File>sgu-20140331_cal.xml</File>
    <File>sgu-20140331_def.xml</File>
    <File>sgu-20140331_lab.xml</File>
    <File>sgu-20140331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
