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Partnership's Repurchase Activities (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 36 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Mar. 31, 2015 | Sep. 30, 2014
Capital Unit [Line Items] |  |  |  |  |  |
Partnership's common units authorized for repurchase |  |  | 6,044 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |  |
Private Transaction |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |
Partnership's common units authorized for repurchase |  |  | 1,150 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = sgu_PrivateTransactionMember |  | 1,450 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = sgu_PrivateTransactionMember |
Plan III Common Units Repurchase Program |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |
Partnership's common units authorized for repurchase |  |  | 4,894 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = sgu_StockRepurchaseProgramThreeMember |  |  |
Total Number of Units Purchased | 123 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = sgu_StockRepurchaseProgramThreeMember | [1] | 123 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = sgu_StockRepurchaseProgramThreeMember | [1] | 3,619 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = sgu_StockRepurchaseProgramThreeMember | [1],[2]
Average Price Paid per Unit | $ 5.64 sgu_AveragePricePaidPerUnit / us-gaap_ShareRepurchaseProgramAxis = sgu_StockRepurchaseProgramThreeMember | [3] | $ 5.64 sgu_AveragePricePaidPerUnit / us-gaap_ShareRepurchaseProgramAxis = sgu_StockRepurchaseProgramThreeMember | [3] | $ 4.69 sgu_AveragePricePaidPerUnit / us-gaap_ShareRepurchaseProgramAxis = sgu_StockRepurchaseProgramThreeMember | [2],[3]
Maximum Number of Units that May Yet Be Purchased | 2,302 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = sgu_StockRepurchaseProgramThreeMember |  | 2,302 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = sgu_StockRepurchaseProgramThreeMember |  | 2,425 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = sgu_StockRepurchaseProgramThreeMember | [2]
[1] | Units were repurchased as part of a publicly announced program, except as noted in a private transaction.
[2] | Includes 1.45 million common units acquired in a private transaction.
[3] | Amounts include repurchase costs.

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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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