Real Estate and Accumulated Depreciation - Changes in Total Real Estate Investments and Related Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Total real estate investments:
Balance, beginning of year	$ 2,621,105	$ 2,408,136	$ 2,284,126
Acquisitions	0	0	0
Improvements	179,283	216,154	130,300
Retirements	(8,241)	(3,185)	(6,290)
Transfers to assets held for sale	0	0	0
Balance, end of year	2,792,147	2,621,105	2,408,136
Total accumulated depreciation:
Balance, beginning of year	729,470	688,475	650,113
Depreciation expense	46,386	44,163	44,636
Retirements	(8,014)	(3,168)	(6,274)
Transfers to assets held for sale	0	0	0
Balance, end of year	$ 767,842	$ 729,470	$ 688,475