Uncompensated Care (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Health Care Trust Fund [Line Items]
Uncompensated care	$ 1,203,034	$ 1,136,022	$ 998,770
Uncompensated care, percentage	100.00%	100.00%	100.00%
Charity Care
Health Care Trust Fund [Line Items]
Uncompensated care	$ 506,571	$ 515,435	$ 593,474
Uncompensated care, percentage	42.00%	45.00%	59.00%
Uninsured Discounts
Health Care Trust Fund [Line Items]
Uncompensated care	$ 696,463	$ 620,587	$ 405,296
Uncompensated care, percentage	58.00%	55.00%	41.00%