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Condensed Financial Information of Registrant of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 229,618 | $ 327,354 | $ 684,031 | $ 436,834 | $ 181,584 | $ 225,801 | $ 532,052 | $ 384,118 |  | $ 1,677,837 | $ 1,323,555 | $ 1,161,338
General and administrative expenses |  |  |  |  |  |  |  |  |  | 24,227 | 24,998 | 23,366
Operating income | (41,654) | (8,817) | 85,473 | 31,066 | (27,126) | (19,811) | 69,032 | 33,237 |  | 66,068 | 55,332 | 87,404
Income before income taxes | (36,925) | (11,421) | 82,783 | 28,670 | (29,092) | (21,766) | 66,996 | 31,138 | $ 34,400 | 63,107 | 47,276 | 78,672
Net income | $ (21,450) | $ (8,005) | $ 54,778 | $ 30,182 | $ (17,747) | $ (13,332) | $ 39,704 | $ 18,275 |  | 55,505 | 26,900 | 44,934
STAR GROUP, L.P. |  |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  |  | 1,647 | 2,116 | 1,363
Operating income |  |  |  |  |  |  |  |  |  | (1,647) | (2,116) | (1,363)
Income before income taxes |  |  |  |  |  |  |  |  |  | (1,647) | (2,116) | (1,363)
Equity income of Star Acquisitions Inc. and subs |  |  |  |  |  |  |  |  |  | 57,152 | 29,016 | 46,297
Net income |  |  |  |  |  |  |  |  |  | $ 55,505 | $ 26,900 | $ 44,934

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