Commitments and Contingencies - Additional Information (Detail) £ in Millions	1 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2016	Jun. 30, 2016 GBP (£)	Dec. 31, 2011 USD ($) Hospital	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Nov. 30, 2010 USD ($)	Nov. 30, 2010 GBP (£)
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability				$ 215,000,000	$ 204,000,000
Self-insured for professional and general liability, current				48,000,000	48,000,000
Compensation liability claims				68,000,000	68,000,000
Compensation and related benefits				34,000,000	34,000,000
Accounts receivable, net				1,344,916,000	1,302,429,000
Payment suspension period increased	180 days
Letters of Credit and Surety Bonds
Commitments and Contingencies Disclosure [Line Items]
Off-balance sheet contingent obligation				130,000,000
Self Insurance Programs | Letters of Credit and Surety Bonds
Commitments and Contingencies Disclosure [Line Items]
Off-balance sheet contingent obligation				105,000,000
Other Debt Guarantees | Letters of Credit and Surety Bonds
Commitments and Contingencies Disclosure [Line Items]
Off-balance sheet contingent obligation				25,000,000
Location 1
Commitments and Contingencies Disclosure [Line Items]
Minimum Insurance Deductible				50,000
Location 2
Commitments and Contingencies Disclosure [Line Items]
Minimum Insurance Deductible				250,000
Illinois
Commitments and Contingencies Disclosure [Line Items]
Accounts receivable, net				24,000,000	28,000,000
Accounts receivable net greater than sixty days Past due				9,000,000	12,000,000
Texas
Commitments and Contingencies Disclosure [Line Items]
Accounts receivable				38,000,000	80,000,000
Texas | Uncompensated Care Program and Disproportionate Share Hospital
Commitments and Contingencies Disclosure [Line Items]
Accounts receivable				22,000,000
Texas | Delivery System Reform Incentive Pool
Commitments and Contingencies Disclosure [Line Items]
Accounts receivable				16,000,000
Flood | Location 1
Commitments and Contingencies Disclosure [Line Items]
Maximum insurance deductible				500,000
Flood | Location 2
Commitments and Contingencies Disclosure [Line Items]
Maximum insurance deductible				250,000
Cygnet Health Care Limited
Commitments and Contingencies Disclosure [Line Items]
Property insurance | £		£ 180
Maximum | Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				$ 1,000,000,000
Percentage of insurance deductible				5.00%
Maximum | Earthquake | LAS VEGAS, NEVADA
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				$ 500,000,000
Maximum | Earthquake | CALIFORNIA
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				130,000,000
Maximum | Earthquake | UNITED STATES
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				100,000,000
Maximum | Earthquake | PUERTO RICO
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				40,000,000
Maximum | Earthquake | OTHER STATES
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				$ 250,000,000
Minimum | Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Percentage of insurance deductible				3.00%
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
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	$ 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
DPW
Commitments and Contingencies Disclosure [Line Items]
Repayment of legal settlement amount on demand			$ 4,000,000
Percentage of federal share on payments			55.00%
DPW | Pennsylvania
Commitments and Contingencies Disclosure [Line Items]
Number of behavioral health care hospitals | Hospital			7