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Commitments and Contingencies - Additional Information (Detail) £ in Millions | 9 Months Ended | 12 Months Ended | 24 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2017 GBP (£) | Dec. 31, 2011 USD ($) Hospital | Dec. 31, 2013 USD ($) | Jan. 31, 2017 USD ($) | Jan. 31, 2017 GBP (£) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability, current | $ 54,000,000 |  |  |  |  |  | $ 48,000,000 |  |
Compensation liability claims | 70,000,000 |  |  |  |  |  | 67,000,000 |  |
Compensation and related benefits | 33,000,000 |  |  |  |  |  | 33,000,000 |  |
Accounts receivable, net | 1,452,018,000 |  |  |  |  |  | 1,439,553,000 |  |
Department of Human Services |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Repayment of legal settlement amount on demand |  |  | $ 4,000,000 | $ 11,000,000 |  |  |  |  |
McAllen Medical Center |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Amount awarded to plaintiff | 3,850,000 |  |  |  |  |  |  |  |
Total amount of order, including prejudgment interest | 8,500,000 |  |  |  |  |  |  |  |
Letters of Credit and Surety Bonds |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Off-balance sheet contingent obligation | 120,000,000 |  |  |  |  |  |  |  |
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 | 52,000,000 |  |  |  |  |  | 38,000,000 |  |
Accounts receivable net greater than sixty days Past due | 35,000,000 |  |  |  |  |  | 25,000,000 |  |
Pennsylvania | Department of Human Services |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Number of behavioral health care hospitals | Hospital |  |  | 7 |  |  |  |  |  |
Flood | Location 1 |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Maximum insurance deductible | 500,000 |  |  |  |  |  |  |  |
Professional And General Liability |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Increase in professional and general liability self-insurance reserves relating to prior years | 15,000,000 |  |  |  |  |  |  |  |
Self Insurance Programs | Letters of Credit and Surety Bonds |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Off-balance sheet contingent obligation | 113,000,000 |  |  |  |  |  |  |  |
Other Debt Guarantees | Letters of Credit and Surety Bonds |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Off-balance sheet contingent obligation | 7,000,000 |  |  |  |  |  |  |  |
Cygnet Health Care Limited |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Property insurance | £ |  | £ 1,290 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |
General and Professional Liability |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | $ 228,000,000 |  |  |  |  |  | 207,000,000 |  |
Subsidiaries | Professional Liability | Cygnet Health Care Limited |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | £ |  |  |  |  |  | £ 10 |  |  |
Subsidiaries | Professional Liability | Maximum |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability |  |  |  |  | $ 5,000,000 |  | 10,000,000 |  |
Subsidiaries | General Liability | Cygnet Health Care Limited |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | £ |  |  |  |  |  | £ 25 |  |  |
Subsidiaries | General Liability | Maximum |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability |  |  |  |  | $ 3,000,000 |  | 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 |  |  |  | $ 200,000,000 |  |  | $ 250,000,000 | $ 250,000,000 | $ 250,000,000
Liability for claims paid under commercially insured coverage | $ 50,000,000 |  |  |  |  |  |  |  |

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