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Company's Repurchase Activities (Parenthetical) (Detail) - shares shares in Thousands | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Capital Unit [Line Items] |  |
Company's common units authorized for repurchase | 7,344 |
Private Transaction |  |
Capital Unit [Line Items] |  |
Company's common units authorized for repurchase | 2,450 | 2,450

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=sgu_PrivateTransactionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |