Quarterly Financial Data - Summary of Quarterly Results of Operations (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Revenues from rental properties	$ 163,889,000	$ 153,886,000	$ 144,601,000
Net earnings	$ 90,043,000	$ 62,860,000	$ 69,388,000
Diluted earnings per common share:
Net earnings	$ 1.88	$ 1.37	$ 1.62