Leases (Lessee) - Fixed Minimum Rental Payments Due under Leases with Non-Cancelable Terms (Detail) - USD ($) $ in Thousands		Mar. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Operating leases, 2019	[1]	$ 4,598
Operating leases, 2020		6,437
Operating leases, 2021		6,606
Operating leases, 2022		6,750
Operating leases, 2023		6,815
Operating leases, Thereafter		196,788
Operating leases, Total undiscounted minimum lease payments		227,994
Operating Leases, Less: interest		(146,478)
Operating leases, Present value of lease liabilities		81,516	$ 84,000
Finance leases, 2019	[1]	93
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		5,646
Finance leases, Less: interest		(3,717)
Finance leases, Present value of lease liabilities		1,929
Amounts to be received from subleases, 2019	[1]	(2,542)
Amounts to be received from subleases, 2020		(3,456)
Amounts to be received from subleases, 2021		(3,561)
Amounts to be received from subleases, 2022		(3,715)
Amounts to be received from subleases, 2023		(3,719)
Amounts to be received from subleases, Thereafter		(95,320)
Amounts to be received from subleases, Total undiscounted minimum lease payments		(112,313)
Net payments, 2019	[1]	2,149
Net payments, 2020		3,106
Net payments, 2021		3,171
Net payments, 2022		3,163
Net payments, 2023		3,225
Net payments, Thereafter	[2]	106,513
Net payments, Total undiscounted minimum lease payments		$ 121,327

[1] Represents remaining nine 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.