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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, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Condensed Income Statements, Captions [Line Items]                          
Revenues $ 183,295 $ 232,155 $ 543,063 $ 508,945 $ 235,887 $ 283,376 $ 699,582 $ 535,027     $ 1,467,458 $ 1,753,872 $ 1,677,837
General and administrative expenses                     25,072 28,414 24,227
Operating income (36,098) 498 86,117 42,451 (43,782) (29,933) 105,002 6,063     92,968 37,350 66,068
Income before income taxes (44,051) (2,051) 83,108 39,537 (46,545) (33,153) 101,564 3,288 $ 28,700 $ 34,400 76,543 25,154 63,107
Net income $ (30,199) $ (46) $ 58,408 $ 27,755 $ (33,905) $ (23,098) $ 72,325 $ 2,315     55,918 17,637 55,505
STAR GROUP, L.P.                          
Condensed Income Statements, Captions [Line Items]                          
Revenues                     0 0 0
General and administrative expenses                     1,327 1,377 1,647
Operating income                     (1,327) (1,377) (1,647)
Income before income taxes                     (1,327) (1,377) (1,647)
Equity income of Star Acquisitions Inc. and subs                     57,245 19,014 57,152
Net income                     $ 55,918 $ 17,637 $ 55,505