Commitments and Contingencies - Fixed Minimum Rental Payments Due under Operating Leases with Non-Cancelable Terms (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2019	$ 6,602
2020	6,903
2021	6,841
2022	6,838
2023	6,861
Thereafter	198,932
Minimum rental payments, total	232,977
2019	(3,284)
2020	(3,458)
2021	(3,551)
2022	(3,632)
2023	(3,636)
Thereafter	(93,586)
Sub lease minimum rental payments receivable, total	(111,147)
2019	3,318
2020	3,445
2021	3,290
2022	3,206
2023	3,225
Thereafter	105,346	[1]
Minimum rental payments, total	$ 121,830

[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.