Real Estate and Other Activities - Leasing Operations (Lessor) - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) Property Lease
Lessor Lease Description [Line Items]
Lease renewal term	5 years
Annual rent escalations	99.00%
Number of properties | Property	5
Carrying value of lease requiring residual value guarantee | $	$ 230
Ernest Health Inc [Member]
Lessor Lease Description [Line Items]
Number of direct financing leases	13
Number of financing leases	5
Prime Facilities [Member]
Lessor Lease Description [Line Items]
Number of direct financing leases	5
Prospect [Member]
Lessor Lease Description [Line Items]
Number of financing leases	13
Minimum [Member]
Lessor Lease Description [Line Items]
Term of lease	15 years
Fixed minimum annual escalations	2.00%