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Financial Information Combined Wholly-Owned Subsidiaries - Summarized Statements of Income (Loss) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]      
Revenue $ 2,314,394 $ 2,089,929 $ 2,008,381
Income from continuing operations before income taxes 275,760 183,797 78,395
Net income 195,562 (669,199) 110,122
Net income attributable to Acadia Healthcare Company, Inc. 190,635 $ (672,132) $ 108,923
Parent [Member]      
Condensed Financial Statements, Captions [Line Items]      
Revenue 2,132,637    
Income from continuing operations before income taxes 246,473    
Net income 184,785    
Net income attributable to Acadia Healthcare Company, Inc. $ 184,785