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Financial Information for the Company and Its Subsidiaries - Summarized Statements of Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Condensed Financial Statements, Captions [Line Items]                  
Revenue $ 833,304       $ 777,251     $ 2,366,425 $ 2,327,230
Income before income taxes 44,727       49,560     134,513 146,236
Net income 37,561       42,723     113,342 120,435
Net income (loss) attributable to Acadia Healthcare Company, Inc. $ 36,998 $ 41,079 $ 33,463 $ (11,254) $ 42,566 $ 48,140 $ 29,471 111,540 $ 120,177
Parent [Member]                  
Condensed Financial Statements, Captions [Line Items]                  
Revenue               1,443,685  
Income before income taxes               104,217  
Net income               84,162  
Net income (loss) attributable to Acadia Healthcare Company, Inc.               $ 84,162