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Financial Information for the Company and Its Subsidiaries - Summarized Statements of Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Condensed Financial Statements, Captions [Line Items]          
Revenue $ 616,653       $ 551,199
Income before income taxes 79,312       29,324
Net income 61,910       10,479
Net income attributable to Acadia Healthcare Company, Inc. 60,837 $ 70,278 $ 66,126 $ 44,514 $ 9,717
Parent [Member]          
Condensed Financial Statements, Captions [Line Items]          
Revenue 569,806        
Income before income taxes 72,712        
Net income 56,687        
Net income attributable to Acadia Healthcare Company, Inc. $ 56,687