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Summary of Restricted Stock Unit Grants Since Inception (Detail) - Restricted Stock Units - shares	12 Months Ended			60 Months Ended	216 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards	0	0	0	0	378,403
Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards					336,736
Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awards					41,667

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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