Leases (Lessee) - Fixed Minimum Rental Payments Due under Leases with Non-Cancelable Terms (Detail) - USD ($) $ in Thousands		Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Operating leases, 2019	[1]	$ 3,111
Operating leases, 2020		6,341
Operating leases, 2021		6,533
Operating leases, 2022		6,734
Operating leases, 2023		6,800
Operating leases, Thereafter		196,489
Operating leases, Total undiscounted minimum lease payments		226,008
Operating Leases, Less: interest		(145,048)
Operating leases, Present value of lease liabilities		80,960	$ 84,000
Finance leases, 2019	[1]	62
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		5,615
Finance leases, Less: interest		(3,685)
Finance leases, Present value of lease liabilities		1,930
Amounts to be received from subleases, 2019	[1]	(1,693)
Amounts to be received from subleases, 2020		(3,444)
Amounts to be received from subleases, 2021		(3,561)
Amounts to be received from subleases, 2022		(3,699)
Amounts to be received from subleases, 2023		(3,704)
Amounts to be received from subleases, Thereafter		(95,622)
Amounts to be received from subleases, Total undiscounted minimum lease payments		(111,723)
Net payments, 2019	[1]	1,480
Net payments, 2020		3,022
Net payments, 2021		3,098
Net payments, 2022		3,163
Net payments, 2023		3,225
Net payments, Thereafter	[2]	105,912
Net payments, Total undiscounted minimum lease payments		$ 119,900

[1] Represents remaining six 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.