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Financial Information for the Company and Its Subsidiaries - Summarized Statements of Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Condensed Financial Statements, Captions [Line Items]                
Revenue $ 582,156       $ 491,475   $ 1,133,355 $ 1,000,692
Income before income taxes 64,997       36,850   94,321 61,634
Net income 45,664       41,714   56,143 75,781
Net income (loss) attributable to Acadia Healthcare Company, Inc. $ 44,514 $ 9,717 $ (783,672) $ 36,998 $ 41,079 $ 33,463 54,231 $ 74,542
Parent [Member]                
Condensed Financial Statements, Captions [Line Items]                
Revenue             1,047,201  
Income before income taxes             82,418  
Net income             59,584  
Net income (loss) attributable to Acadia Healthcare Company, Inc.             $ 59,584