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Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 16, 2016
Jan. 12, 2016
May 11, 2015
Feb. 11, 2015
Dec. 31, 2016
Dec. 31, 2015
Mar. 03, 2016
Equity [Line Items]              
Preferred stock, number of shares proposed to be issued         10,000,000 10,000,000  
Common stock, number of shares proposed to be issued         180,000,000 90,000,000  
Common stock voting rights         One vote for each share    
Common stock offered   11,500,000 5,175,000   86,688,199 70,745,746  
Common stock offer price   $ 61.00 $ 66.50   $ 0.01 $ 0.01  
Underwriting discount amount   $ 15,800 $ 12,000        
Additional offering-related costs   700 800        
Net proceeds from sale of shares   $ 685,000 $ 331,300   $ 216,882 $ 380,210  
CRC Health Group, Inc [Member]              
Equity [Line Items]              
Total consideration related to acquisition       $ 1,300,000      
Shares issued for acquisition       5,975,326      
Priory [Member]              
Equity [Line Items]              
Total consideration related to acquisition $ 2,200,000            
Shares issued for acquisition 4,033,561            
Business acquisition cash paid $ 1,900,000            
Maximum [Member]              
Equity [Line Items]              
Preferred stock, number of shares proposed to be issued         10,000,000    
Maximum [Member] | Amendment [Member]              
Equity [Line Items]              
Common stock, number of shares proposed to be issued             180,000,000