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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
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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