Commitments and Contingencies - Fixed Minimum Rental Payments Due under Operating Leases with Non-Cancelable Terms (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2018	$ 8,210
2019	8,753
2020	8,967
2021	8,063
2022	8,121
Thereafter	191,457
Minimum rental payments, total	233,571
2018	(4,386)
2019	(3,946)
2020	(4,097)
2021	(4,175)
2022	(4,118)
Thereafter	(96,028)
Sub lease minimum rental payments receivable, total	(116,750)
2018	3,824
2019	4,807
2020	4,870
2021	3,888
2022	4,003
Thereafter	95,429	[1]
Minimum rental payments, total	$ 116,821

[1] Reflects certain ground leases, in which we are the lessee, that have longer 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.