Real Estate and Accumulated Depreciation - Changes in Total Real Estate Investments and Related Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Total real estate investments:
Balance, beginning of year	$ 2,408,136	$ 2,284,126	$ 2,124,796
Acquisitions	0	0	108,279
Improvements	216,154	130,300	54,177
Retirements	(3,185)	(6,290)	(3,126)
Balance, end of year	2,621,105	2,408,136	2,284,126
Total accumulated depreciation:
Balance, beginning of year	688,475	650,113	607,706
Depreciation expense	44,163	44,636	45,487
Retirements	(3,168)	(6,274)	(3,080)
Balance, end of year	$ 729,470	$ 688,475	$ 650,113