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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, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Condensed Income Statements, Captions [Line Items]                        
Revenues $ 235,887 $ 283,376 $ 699,582 $ 535,027 $ 229,618 $ 327,354 $ 684,031 $ 436,834   $ 1,753,872 $ 1,677,837 $ 1,323,555
General and administrative expenses                   28,414 24,227 24,998
Operating income (loss) (43,782) (29,933) 105,002 6,063 (41,654) (8,817) 85,473 31,066   37,350 66,068 55,332
Income before income taxes (46,545) (33,153) 101,564 3,288 (36,925) (11,421) 82,783 28,670 $ 34,400 25,154 63,107 47,276
Net income (loss) $ (33,905) $ (23,098) $ 72,325 $ 2,315 $ (21,450) $ (8,005) $ 54,778 $ 30,182   17,637 55,505 26,900
STAR GROUP, L.P.                        
Condensed Income Statements, Captions [Line Items]                        
Revenues                   0 0 0
General and administrative expenses                   1,377 1,647 2,116
Operating income (loss)                   (1,377) (1,647) (2,116)
Income before income taxes                   (1,377) (1,647) (2,116)
Equity income of Star Acquisitions Inc. and subs                   19,014 57,152 29,016
Net income (loss)                   $ 17,637 $ 55,505 $ 26,900