Leases - Future Contractual Minimum Annual Rentals Receivable Under Previous Lease Accounting Standard (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Operating leases
2019	$ 102,928
2020	102,693
2021	99,593
2022	99,184
2023	99,223
Thereafter	678,106
Total	1,181,727
Direct financing leases
2019	12,864
2020	13,156
2021	13,339
2022	13,420
2023	13,467
Thereafter	73,030
Total	$ 139,276