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Commitments and Contingencies - Additional Information (Detail) (USD $) | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Illinois | Dec. 31, 2011 Illinois | Jun. 30, 2012 Wind Storms | Jun. 30, 2012 Wind Storms Maximum | Jun. 30, 2012 Wind Storms Minimum | Jun. 30, 2012 Earthquake | Jun. 30, 2012 Earthquake United States | Jun. 30, 2012 Earthquake United States Maximum | Jun. 30, 2012 Earthquake United States Minimum | Jun. 30, 2012 Earthquake Puerto Rico | Jun. 30, 2012 Flood Location 1 | Jun. 30, 2012 Flood Location 2 | Jun. 30, 2012 Self Insurance Programs | Jun. 30, 2012 Other debt and public utility guarantees | Nov. 15, 2010 Subsidiaries | Nov. 14, 2010 Subsidiaries | Jan. 01, 2008 Subsidiaries Maximum | Nov. 15, 2010 Subsidiaries Minimum | Nov. 14, 2010 Subsidiaries Minimum | Jun. 30, 2012 Psychiatric Solutions Inc | Nov. 14, 2010 Psychiatric Solutions Inc Maximum | Nov. 15, 2010 Psychiatric Solutions Inc Minimum | Nov. 14, 2010 Psychiatric Solutions Inc Minimum | Nov. 15, 2010 Legacy Subsidiaries
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Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | $ 288,000,000 | $ 292,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  | $ 75,000,000 | $ 3,000,000 | $ 3,000,000 | $ 10,000,000
Purchased several excess policies through commercial insurance carriers per occurrence |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 | 200,000,000 |  |  |  |  |
Percentage of liability for claims paid under commercially insured coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |
Liability for claims paid under commercially insured coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 | 60,000,000 |  |  |  |  |  |  |  |
Self-insured for professional and general liability, current | 60,000,000 | 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  |  |  |  |  | 1,000,000,000 |  | 250,000,000 | 100,000,000 |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum insurance deductible |  |  |  |  | 250,000 |  |  | 250,000 |  |  |  |  | 250,000 | 500,000 |  |  |  |  |  |  |  | 50,000 |  |  |  |
Percentage of insurance deductible |  |  |  |  |  | 5.00% | 3.00% |  |  | 5.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 1,019,929,000 | 969,802,000 | 72,000,000 | 54,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable 60 days past due |  |  | 52,000,000 | 41,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Off-balance sheet contingent obligation | $ 81,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65,000,000 | $ 16,000,000 |  |  |  |  |  |  |  |  |  |

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