Reconciliations of Equity - Reconciliations of Total Equity (Parenthetical) (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Number of shares of common stock issued under incentive compensation plan	6,791	1,133	32,772	2,647
Number of common stock shares purchased		69,734		167,940
Common stock	$ 0.365	$ 0.335	$ 0.73	$ 0.67
Common Stock [Member]
Number of shares of common stock issued under incentive compensation plan	6,791	1,133	32,772	2,647
Additional Paid-in Capital [Member]
Number of shares of common stock issued under incentive compensation plan	6,791	1,133	32,772	2,647
Common Treasury Stock [Member]
Number of common stock shares purchased		69,734		167,940
Retained Earnings [Member]
Common stock	$ 0.365	$ 0.335	$ 0.73	$ 0.67