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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Condensed Financial Statements, Captions [Line Items]                  
Revenue $ 587,559       $ 547,961     $ 1,720,914 $ 1,548,653
Income before income taxes 85,311       46,078     179,632 107,712
Net income 67,900       37,561     124,043 113,342
Net income (loss) attributable to Acadia Healthcare Company, Inc. $ 66,126 $ 44,514 $ 9,717 $ (783,672) $ 36,998 $ 41,079 $ 33,463 120,357 $ 111,540
Parent [Member]                  
Condensed Financial Statements, Captions [Line Items]                  
Revenue               1,585,837  
Income before income taxes               158,117  
Net income               119,785  
Net income (loss) attributable to Acadia Healthcare Company, Inc.               $ 119,785