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Condensed Financial Information of Registrant of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 162,064 | $ 218,194 | $ 462,025 | $ 319,055 | $ 167,161 | $ 245,604 | $ 762,309 | $ 499,217 | $ 1,161,338 | $ 1,674,291 | $ 1,961,724
General and administrative expenses |  |  |  |  |  |  |  |  | 23,366 | 25,908 | 22,592
Operating income | (29,606) | (2,955) | 96,319 | 23,646 | (61,182) | (10,073) | 134,095 | 30,773 | 87,404 | 93,613 | 79,855
Net interest expense |  |  |  |  |  |  |  |  | (7,485) | (14,059) | (16,854)
Amortization of debt issuance costs |  |  |  |  |  |  |  |  | (1,247) | (1,818) | (1,602)
Loss on redemption of debt |  |  |  |  |  |  |  |  |  | (7,345) |
Net loss before equity income | (31,923) | (4,993) | 94,113 | 21,475 | (72,428) | (13,970) | 129,876 | 26,913 | 78,672 | 70,391 | 61,399
Net income | $ (19,095) | $ (3,238) | $ 55,209 | $ 12,058 | $ (45,326) | $ (8,359) | $ 75,687 | $ 15,554 | 44,934 | 37,556 | 36,084
STAR GAS PARTNERS, L.P. |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  | 1,363 | 1,314 | 1,420
Operating income |  |  |  |  |  |  |  |  | (1,363) | (1,314) | (1,420)
Net interest expense |  |  |  |  |  |  |  |  |  | (10,342) | (11,206)
Amortization of debt issuance costs |  |  |  |  |  |  |  |  |  | (521) | (520)
Loss on redemption of debt |  |  |  |  |  |  |  |  |  | (7,345) |
Net loss before equity income |  |  |  |  |  |  |  |  | (1,363) | (19,522) | (13,146)
Equity income of Star Petro Inc. and subs |  |  |  |  |  |  |  |  | 46,297 | 57,078 | 49,230
Net income |  |  |  |  |  |  |  |  | $ 44,934 | $ 37,556 | $ 36,084

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