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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, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Condensed Financial Statements, Captions [Line Items]                
Revenue $ 750,311       $ 789,362   $ 1,533,121 $ 1,549,979
Income before income taxes 49,930       59,805   89,786 96,676
Net income 41,714       48,201   75,781 77,712
Net income (loss) attributable to Acadia Healthcare Company, Inc. $ 41,079 $ 33,463 $ (11,254) $ 42,566 $ 48,140 $ 29,471 74,542 $ 77,611
Parent [Member]                
Condensed Financial Statements, Captions [Line Items]                
Revenue             933,772  
Income before income taxes             60,120  
Net income             46,143  
Net income (loss) attributable to Acadia Healthcare Company, Inc.             $ 46,143