Schedule of Disaggregates Revenue by Major Source (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Revenues		$ 2,729,754	$ 2,855,168	$ 5,559,421	$ 5,659,559
Acute Care Hospital Services
Disaggregation Of Revenue [Line Items]
Revenues		1,467,506	1,531,709	2,988,555	3,046,553
Acute Care Hospital Services | Governmental Stimulus Program
Disaggregation Of Revenue [Line Items]
Revenues		157,000		157,000
Behavioral Health Services
Disaggregation Of Revenue [Line Items]
Revenues	[1]	1,259,123	$ 1,320,241	2,565,232	$ 2,606,624
Behavioral Health Services | Governmental Stimulus Program
Disaggregation Of Revenue [Line Items]
Revenues		$ 61,000		$ 61,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $136 million and $144 million for the three-month periods ended June 30, 2020 and 2019, respectively, and approximately $273 million and $281 million for the six-month periods ended June 30, 2020 and 2019, respectively.  Total assets at our U.K. behavioral health care facilities were approximately $1.192 billion and $1.217 billion as of June 30, 2020 and 2019, respectively.