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Commitments and Contingencies - Additional Information (Detail)
£ in Millions
 1 Months Ended 6 Months Ended
Mar. 31, 2015
Nov. 30, 2010
GBP (£)
Facility
Jun. 30, 2015
GBP (£)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Oct. 31, 2012
USD ($)
Nov. 30, 2010
USD ($)
Commitments and Contingencies Disclosure [Line Items]                
Self-insured for professional and general liability       $ 201,000,000 $ 193,000,000      
Self-insured for professional and general liability, current       51,000,000 51,000,000      
Compensation liability claims       68,000,000 67,000,000      
Compensation and related benefits       32,000,000 32,000,000      
Accounts receivable, net       1,360,973,000 1,282,735,000      
Payment suspension period increased 180 days              
Letters of Credit and Surety Bonds                
Commitments and Contingencies Disclosure [Line Items]                
Off-balance sheet contingent obligation       118,000,000        
Cygnet Health Care Limited                
Commitments and Contingencies Disclosure [Line Items]                
Number of inpatient behavioral health hospitals | Facility   15            
Number of facilities | Facility   17            
Number of nursing homes | Facility   2            
Property insurance | £     £ 180          
Professional Liability | Cygnet Health Care Limited                
Commitments and Contingencies Disclosure [Line Items]                
Self-insured for professional and general liability | £   £ 10            
General Liability | Cygnet Health Care Limited                
Commitments and Contingencies Disclosure [Line Items]                
Self-insured for professional and general liability | £   £ 25            
Location 2                
Commitments and Contingencies Disclosure [Line Items]                
Minimum Insurance Deductible       250,000        
Location 1                
Commitments and Contingencies Disclosure [Line Items]                
Minimum Insurance Deductible       50,000        
Illinois                
Commitments and Contingencies Disclosure [Line Items]                
Accounts receivable, net       24,000,000 44,000,000      
Accounts receivable net greater than sixty days Past due       8,000,000 23,000,000      
Accounts receivable       97,000,000 $ 102,000,000      
Illinois | Uncompensated Care Program Revenues                
Commitments and Contingencies Disclosure [Line Items]                
Accounts receivable       52,000,000        
Illinois | Disproportionate Share Hospital Program Revenues                
Commitments and Contingencies Disclosure [Line Items]                
Accounts receivable       27,000,000        
Illinois | Delivery System Reform Incentive Pool                
Commitments and Contingencies Disclosure [Line Items]                
Accounts receivable       18,000,000        
Wind Storms | Maximum                
Commitments and Contingencies Disclosure [Line Items]                
Commercial property insurance policies covering catastrophic losses       $ 1,000,000,000        
Percentage of insurance deductible       5.00%        
Wind Storms | Minimum                
Commitments and Contingencies Disclosure [Line Items]                
Percentage of insurance deductible       3.00%        
Earthquake                
Commitments and Contingencies Disclosure [Line Items]                
Minimum Insurance Deductible       $ 250,000        
Earthquake | Maximum                
Commitments and Contingencies Disclosure [Line Items]                
Commercial property insurance policies covering catastrophic losses       250,000,000        
Earthquake | UNITED STATES | Maximum                
Commitments and Contingencies Disclosure [Line Items]                
Commercial property insurance policies covering catastrophic losses       $ 100,000,000        
Percentage of insurance deductible       5.00%        
Earthquake | UNITED STATES | Minimum                
Commitments and Contingencies Disclosure [Line Items]                
Percentage of insurance deductible       1.00%        
Earthquake | PUERTO RICO                
Commitments and Contingencies Disclosure [Line Items]                
Commercial property insurance policies covering catastrophic losses       $ 25,000,000        
Maximum insurance deductible       25,000        
Flood | Location 2                
Commitments and Contingencies Disclosure [Line Items]                
Maximum insurance deductible       250,000        
Flood | Location 1                
Commitments and Contingencies Disclosure [Line Items]                
Maximum insurance deductible       $ 500,000        
Subsidiaries | Professional Liability | Maximum                
Commitments and Contingencies Disclosure [Line Items]                
Self-insured for professional and general liability               $ 10,000,000
Subsidiaries | General Liability | Maximum                
Commitments and Contingencies Disclosure [Line Items]                
Self-insured for professional and general liability               $ 3,000,000
Subsidiaries | General and Professional Liability Insurance Policies                
Commitments and Contingencies Disclosure [Line Items]                
Percentage of liability for claims paid under commercially insured coverage       10.00%        
Subsidiaries | General and Professional Liability Insurance Policies | Maximum                
Commitments and Contingencies Disclosure [Line Items]                
Purchased several excess policies through commercial insurance carriers per occurrence       $ 250,000,000   $ 200,000,000    
Liability for claims paid under commercially insured coverage       60,000,000        
Subsidiaries | General and Professional Liability Insurance Policies | Minimum                
Commitments and Contingencies Disclosure [Line Items]                
Liability for claims paid under commercially insured coverage       10,000,000        
Psychiatric Solutions Inc | General and Professional Liability Insurance Policies | Maximum                
Commitments and Contingencies Disclosure [Line Items]                
Self-insured for professional and general liability       3,000,000        
Behavioral Health Facilities Acquired from Ascend Health Corporation | General and Professional Liability Insurance Policies                
Commitments and Contingencies Disclosure [Line Items]                
Minimum Insurance Deductible             $ 100,000  
Behavioral Health Facilities Acquired from Ascend Health Corporation | General and Professional Liability Insurance Policies | Maximum                
Commitments and Contingencies Disclosure [Line Items]                
Self-insured for professional and general liability             $ 12,000,000  
Self Insurance Programs | Letters of Credit and Surety Bonds                
Commitments and Contingencies Disclosure [Line Items]                
Off-balance sheet contingent obligation       96,000,000        
Other Debt Guarantees | Letters of Credit and Surety Bonds                
Commitments and Contingencies Disclosure [Line Items]                
Off-balance sheet contingent obligation       $ 22,000,000