Lease Commitments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 USD ($) Hospital	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Lessee Lease Description [Line Items]
Lessee, operating lease, existence of option to extend [true false]	true
Number of hospital facilities | Hospital	5
Right-of-use assets obtained in exchange for operating lease obligations	$ 95,805,000	$ 69,678,000	$ 383,857,000
Finance lease obligations	$ 29,000,000	$ 37,000,000	0
New Operating Leases
Lessee Lease Description [Line Items]
Right-of-use assets obtained in exchange for operating lease obligations			$ 29,300,000
Two Hospital Facilities
Lessee Lease Description [Line Items]
Lease expiration term	2026
Third and Fourth Hospital Facilities
Lessee Lease Description [Line Items]
Lease expiration term	2033
Fifth Hospital Facility
Lessee Lease Description [Line Items]
Lease expiration term	2040
Minimum
Lessee Lease Description [Line Items]
Initial term of real estate lease	5 years
Real estate leases option to extend lease term	5 years
Maximum
Lessee Lease Description [Line Items]
Initial term of real estate lease	10 years
Real estate leases option to extend lease term	10 years