Leases (Lessee) - Fixed Minimum Rental Payments Due under Leases with Non-Cancelable Terms (Detail) - USD ($) $ in Thousands		Sep. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Operating Leases, 2019	[1]	$ 1,487
Operating Leases, 2020		6,040
Operating Leases, 2021		6,219
Operating Leases, 2022		6,407
Operating Leases, 2023		6,470
Operating Leases, Thereafter		183,294
Operating Leases, Total undiscounted minimum lease payments		209,917
Operating Leases, Less: interest		(134,274)
Operating Leases, Present value of lease liabilities		75,643	$ 84,000
Finance Leases, 2019	[1]	31
Finance Leases, 2020		125
Finance Leases, 2021		126
Finance Leases, 2022		128
Finance Leases, 2023		129
Finance Leases, Thereafter		5,045
Finance Leases, Total undiscounted minimum lease payments		5,584
Finance Leases, Less: interest		(3,653)
Finance Leases, Present value of lease liabilities		1,931
Amounts to be Received From Subleases, 2019	[1]	(816)
Amounts to be Received From Subleases, 2020		(3,322)
Amounts to be Received From Subleases, 2021		(3,439)
Amounts to be Received From Subleases, 2022		(3,567)
Amounts to be Received From Subleases, 2023		(3,568)
Amounts to be Received From Subleases, Thereafter		(92,095)
Amounts to be Received From Subleases, Total undiscounted minimum lease payments		(106,807)
Net Payments, 2019	[1]	702
Net Payments, 2020		2,843
Net Payments, 2021		2,906
Net Payments, 2022		2,968
Net Payments, 2023		3,031
Net Payments, Thereafter	[2]	96,244
Net Payments, Total undiscounted minimum lease payments		$ 108,694

[1] Represents remaining three months of 2019.

[2] 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.