Leases (Lessee) - Schedule of Fixed Minimum Rental Payments Due under Leases with Non-Cancelable Terms (Detail) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating Leases, 2021		$ 7,186
Operating Leases, 2022		7,384
Operating Leases, 2023		7,451
Operating Leases, 2024		6,557
Operating Leases, 2025		5,660
Operating Leases, Thereafter		257,730
Operating Leases, Total undiscounted minimum lease payments		291,968
Operating Leases, Less: interest		(201,962)
Operating Leases, Present value of lease liabilities		90,006	$ 76,353
Finance Leases, 2021		126
Finance Leases, 2022		128
Finance Leases, 2023		129
Finance Leases, 2024		130
Finance Leases, 2025		131
Finance Leases, Thereafter		4,783
Finance Leases, Total undiscounted minimum lease payments		5,427
Finance Leases, Less: interest		(3,492)
Finance Leases, Present value of lease liabilities		1,935	$ 1,932
Amounts To Be Received From Subleases, 2021		(2,952)
Amounts To Be Received From Subleases, 2022		(3,238)
Amounts To Be Received From Subleases, 2023		(3,240)
Amounts To Be Received From Subleases, 2024		(3,259)
Amounts To Be Received From Subleases, 2025		(3,303)
Amounts To Be Received From Subleases, Thereafter		(78,494)
Amounts To Be Received From Subleases, Total undiscounted minimum lease payments		(94,486)
Net Payments, 2021		4,360
Net Payments, 2022		4,274
Net Payments, 2023		4,340
Net Payments, 2024		3,428
Net Payments, 2025		2,488
Net Payments, Thereafter	[1]	184,019
Net Payments, Total undiscounted minimum lease payments		$ 202,909

[1] Reflects certain ground leases, in which we are the lessee, that have longer initial fixed terms than our existing sublease to our tenants. However, we would expect to either renew the related sublease, enter into a lease with a new tenant, or early terminate the ground lease to reduce or avoid any significant impact from such ground leases.