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Summary of Restricted Stock Grants Since Inception (Detail) - Restricted Stock - shares	12 Months Ended			228 Months Ended	264 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards	94,503	91,088	97,260	2,002,376	2,285,227
Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards	0	0	0	1,171,576	1,171,576
Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards	94,503	91,088	97,260	830,800	1,113,651

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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