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Partnership's Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Debt Instrument [Line Items]    
8.875% Senior Notes, Carrying Amount $ 124,632us-gaap_LongTermDebt [1] $ 124,572us-gaap_LongTermDebt [1]
Revolving Credit Facility Borrowings, Carrying Amount 0us-gaap_ShortTermBorrowings [2] 0us-gaap_ShortTermBorrowings [2]
Total debt, Carrying Amount 124,632us-gaap_DebtLongtermAndShorttermCombinedAmount 124,572us-gaap_DebtLongtermAndShorttermCombinedAmount
Total long-term portion of debt, Carrying Amount 124,632us-gaap_LongTermDebtNoncurrent 124,572us-gaap_LongTermDebtNoncurrent
8.875% Senior Notes, Fair Value 130,000us-gaap_LongTermDebtFairValue [1],[3] 130,313us-gaap_LongTermDebtFairValue [1],[3]
Revolving Credit Facility Borrowings, Fair Value 0us-gaap_ShorttermDebtFairValue [2],[3] 0us-gaap_ShorttermDebtFairValue [2],[3]
Total debt, Fair Value 130,000us-gaap_DebtInstrumentFairValue [3] 130,313us-gaap_DebtInstrumentFairValue [3]
8.875% Senior Notes    
Debt Instrument [Line Items]    
8.875% Senior Notes, Fair Value $ 130,000us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= sgu_EightPointEightSevenFivePercentSeniorNotesMember		 [3] $ 130,313us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= sgu_EightPointEightSevenFivePercentSeniorNotesMember		 [3]
[1] The 8.875% Senior Notes were originally issued in November 2010 in a private placement offering pursuant to Rule 144A and Regulation S under the Securities Act of 1933, and in February 2011, were exchanged for substantially identical public notes registered with the Securities and Exchange Commission. These public notes mature in December 2017 and accrue interest at an annual rate of 8.875% requiring semi-annual interest payments on June 1 and December 1 of each year. The discount on these notes was $0.4 million at March 31, 2015. Under the terms of the indenture, these notes permit restricted payments after passing particular financial tests. The Partnership can incur debt up to $100 million for acquisitions and can also pay restricted payments of $22.0 million without passing financial tests.
[2] In January 2014, the Partnership entered into a second amended and restated asset based revolving credit facility agreement with a bank syndicate comprised of fifteen participants, which replaced the then existing revolving credit facility.
[3] The Partnership's fair value estimates of long-term debt are made at a specific point in time, based on Level 2 inputs.