Leases - Future Contractual Minimum Annual Rentals Receivable (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Future Minimum Lease Payments For Capital Leases And Operating Leases [Abstract]
2018	$ 95,991
2019	97,000
2020	93,252
2021	90,210
2022	89,582
Thereafter	676,461
2018	12,872
2019	13,079
2020	13,375
2021	13,552
2022	13,616
Thereafter	87,947
2018	108,863
2019	110,079
2020	106,627
2021	103,762
2022	103,198
Thereafter	$ 764,408