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Segment Reporting (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Net revenues $ 2,642,787 $ 2,541,864 $ 2,612,356 $ 2,612,858 $ 2,475,685 $ 2,409,872 $ 2,430,855 $ 2,449,798 $ 10,409,865 $ 9,766,210 $ 9,043,451
Total assets 10,761,828       10,317,802       10,761,828 10,317,802 9,615,444
Behavioral Health Services                      
Segment Reporting Information [Line Items]                      
Net revenues [1]                 4,906,719 4,645,007 4,400,335
Total assets [1] 6,648,818       6,440,195       6,648,818 6,440,195 5,867,088
Behavioral Health Services | Located in U.K.                      
Segment Reporting Information [Line Items]                      
Net revenues                 429,000 241,000 203,000
Total assets $ 1,098       $ 965,000       $ 1,098 $ 965,000 $ 521,000
[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $429 million in 2017, $241 million in 2016 and $203 million in 2015. Total assets at our U.K. behavioral health care facilities were approximately $1.098 billion as of December 31, 2017, $965 million as of December 31, 2016 and $521 million as of December 31, 2015.