Estimated Cost of Providing Uncompensated Care (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Health Care Trust Fund [Line Items]
Estimated cost of providing uncompensated care	$ 161,013	$ 177,189	$ 172,713
Charity Care
Health Care Trust Fund [Line Items]
Estimated cost of providing uncompensated care	95,675	131,890	145,350
Uninsured Discounts
Health Care Trust Fund [Line Items]
Estimated cost of providing uncompensated care	$ 65,338	$ 45,299	$ 27,363