Leases - Schedule of Future Minimum Rental Revenues from Rental Properties and Minimum Rental Payments under ASC 840 (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Minimum Rental Revenues
2019	$ 306,740
2020	279,374
2021	243,379
2022	202,371
2023	150,909
Thereafter	417,296
Total future minimum rental revenues	1,600,069
Minimum Rental Payments
2019	3,253
2020	4,070
2021	4,080
2022	3,928
2023	3,417
Thereafter	120,825
Total future minimum rental payments	$ 139,573