Uncompensated Care (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Health Care Trust Fund [Line Items]
Total uncompensated care	$ 2,201,138	$ 2,184,064	$ 1,894,594
Uncompensated care, percentage	100.00%	100.00%	100.00%
Charity Care
Health Care Trust Fund [Line Items]
Total uncompensated care	$ 622,668	$ 672,326	$ 761,783
Uncompensated care, percentage	28.00%	31.00%	40.00%
Uninsured Discounts
Health Care Trust Fund [Line Items]
Total uncompensated care	$ 1,578,470	$ 1,511,738	$ 1,132,811
Uncompensated care, percentage	72.00%	69.00%	60.00%